Bootloop and download mode not reachable - Samsung Galaxy S21 Questions

Hello everyone,
First of all, thank you to all community members. For the past several years, I have been just a passive reader here and gained a lot of information and insight on various topics.
But now I'm facing a problem, that goes beyond my knowledge and I also couldn't find any solution online so far. Maybe you can come along with new ideas.
So what has happened?
I was flashing the newest stock rom to my S21 5G, but somehow odin wasn't working properly in the beginning.
I tried different usb ports and different cables, the 3rd port seemed to function.
Anyway now I'm stuck with a bootloop. I can enter stock recovery, but I can't enter to the download mode.
Factory reset doesn't help. ADP is enabled. Bootloader unlocked.
so I'm asking myself if there is any way to flash a full stock rom via sideload? What could be the reason that download mode is not reachable?

Try turning your device off completely, without a USB cable connected. Leave it off for now.
Make sure you're using Odin 3.14. Redownload the firmware just to be safe; use Frija or Sammobile (I recommend Frija because Sammobile is slow)
Start Odin, and plug a USB cable into your computer. DO NOT plug it into your phone yet.
Hold both Volume + and - buttons, DO NOT press Power. While holding both buttons, plug in the USB cable. Your device should start in download mode.
You can now use Odin to flash the new firmware. Make sure you use the HOME_CSC_xxxxxx instead of CSC_xxxxxx; the latter will wipe data.
If you want to try sideloading an OTA package, try this guide.

Thank you very much, you saved my phone
My mistake was, that I was trying it with volume up + v. down + power button.

V0latyle said:
Try turning your device off completely, without a USB cable connected. Leave it off for now.
Make sure you're using Odin 3.14. Redownload the firmware just to be safe; use Frija or Sammobile (I recommend Frija because Sammobile is slow)
Start Odin, and plug a USB cable into your computer. DO NOT plug it into your phone yet.
Hold both Volume + and - buttons, DO NOT press Power. While holding both buttons, plug in the USB cable. Your device should start in download mode.
You can now use Odin to flash the new firmware. Make sure you use the HOME_CSC_xxxxxx instead of CSC_xxxxxx; the latter will wipe data.
If you want to try sideloading an OTA package, try this guide.
Click to expand...
Click to collapse
I thank you very much. I'm an amateur when it comes to phones. You saved me after I was stuck with bootloop 2 for days now. Again, I really thank you, I had to sign up for an XDA account to thank you. (Google Translate)

V0latyle said:
Try turning your device off completely, without a USB cable connected. Leave it off for now.
Make sure you're using Odin 3.14. Redownload the firmware just to be safe; use Frija or Sammobile (I recommend Frija because Sammobile is slow)
Start Odin, and plug a USB cable into your computer. DO NOT plug it into your phone yet.
Hold both Volume + and - buttons, DO NOT press Power. While holding both buttons, plug in the USB cable. Your device should start in download mode.
You can now use Odin to flash the new firmware. Make sure you use the HOME_CSC_xxxxxx instead of CSC_xxxxxx; the latter will wipe data.
If you want to try sideloading an OTA package, try this guide.
Click to expand...
Click to collapse
I know i'm not OP but i had a very similar problem, is there maybe a way to boot into twrp? no button combination seems to work and my phone isn't in a bootloop, just not starting because i have a rom with lower binaries than allowed

Related

Need help rooting/recovering

I tried rooting the phone by flashing an insecure kernel. Now I can't get the phone into download mode. Odin/Kies recognizes the phone in MTP, and windows recognized the phone under debugging/file transfer mode... but Odin won't see the phone under debug. Also, my home key now operates as the back key with no key working as home. I flashed the XWKDD insecure kernel as directed by one of the walk throughs.
Before I flashed anything I couldn't get the phone into download mode using the three button combo, but I was able to do it simply by having the phone in download mode and plugging in the USB cable.
How should I proceed? I assume I need to flash to stock and try again with another kernel, but I can't find that as an option. Is there another way to go into download mode? Please help. I still have the same captivate that I bought on release date and I would love to have a fully functional phone for the first time in over a year!
Thanks in advance!
dross50 said:
I tried rooting the phone by flashing an insecure kernel. Now I can't get the phone into download mode. Odin/Kies recognizes the phone in MTP, and windows recognized the phone under debugging/file transfer mode... but Odin won't see the phone under debug. Also, my home key now operates as the back key with no key working as home. I flashed the XWKDD insecure kernel as directed by one of the walk throughs.
Before I flashed anything I couldn't get the phone into download mode using the three button combo, but I was able to do it simply by having the phone in download mode and plugging in the USB cable.
How should I proceed? I assume I need to flash to stock and try again with another kernel, but I can't find that as an option. Is there another way to go into download mode? Please help. I still have the same captivate that I bought on release date and I would love to have a fully functional phone for the first time in over a year!
Thanks in advance!
Click to expand...
Click to collapse
Download mode, this has ALWAYS worked for me:
Pull battery
Reinsert battery
DO NOT HIT POWER
Hold VolUp + VolDn
Insert USB cable into phone
Phone should power up right into download mode.
Edit: Stock kernel was posted 5-10 minutes ago in dev section BTW.
Thanks! Now I'm able to get into download mode consistently... but I'm getting an error in Odin... "Can't open the serial(COM) port.". Going to try resetting the computer and phone. Unfortunately I'm just enough of a noob at this to know how to get myself into interesting predicaments haha. I had all kinds of fun playing with issues with Cognition before I finally switched over to cm7.
*edit*
I'm back to stock now, thanks again! I don't know why I didn't think to do that, that's how I used to get into download mode on my cappy. Now if only I could get the drivers to work with my phone in debugging mode...

Galaxy S2 i9100 3UK Help Please

Hey,
I decided last night I would try and backup my phone, however Kies thought it would be fun to start updating, and somehow it locked up. Now I get a message on my phone that says :-
Firmware Upgrade Encountered an Issue. Please select recovery mode in Kies and try again.
Now I have done what it says however everytime i connect it up i get a message saying "USB Device Not Recognised"
I have downloaded the drivers, with no such luck, and tried installing them via Kies again with no joy. Reading on the forum I found out about the recovery mode which I have manage to get the phone into and downloaded what I thought was the right thing but it's not working at all.
I think what Ideally i need is a way to get the phone back to a working version, I just have no idea how to do it. I have downloaded Odin as that seems to be a program that every page says.
Not sure if you need the information but it was on 3G UK network.
Sorry this probably sounds extremely noob like but I've spent 10 hours on it already and am confused beyond imagination
Kies is one of them horrible programs that just doesnt work properly.
as you have read about Odin, i will assume you know you can use this to flash a stock firmware to your phone.
Have a look for intratechs thread of offical firmwares (linked below), download one for your phone and flash it via odin.
Please read the top information in his thread it tells you what to do and how to do it.
http://forum.xda-developers.com/showthread.php?t=1075278
How do i resolve the other issue of windows not recognizing it ?
put the phone in download mode and pc should recognize the phone
If we're talking about a phone running stock firmware that you've never mucked around with (rooted it, run non-stock firmware on it, etc, etc), send it in to Samsung/whomever you bought it from for warranty service.'
If you start flashing things in order to try & fix it, you run the slight risk you might brick it/void your warranty. Which means you end up paying to get it fixed.
I wouldn't tempt fate if I were in your situation.
If we're talking about a phone you've been mucking around with (like most of us here ), then go to Samfirmware.com & search for the original firmware that came with your phone & flash it following whatever instructions they have for flashing firmware downloaded from their site.
Alternatively, if you're happy with the latest firmware available for your phone model/carrier/country, find/download the PC version of Checkfus (search for it on here/Google). This will allow you to download a tarball of the latest available firmware for your carrier/country, which you can flash according to the instructions here.
Also, before you do anything, try a factory reset if you haven't already.
1.Find your new firmware version and download the file from the links
2.Extract the file, so that you now have a .tar file.
3.Download and run the Odin software from the provided link (200KB)
4.Reboot the phone to download mode
To do this, turn the phone off, then simultaneously press the volume down key, the home button and then press the power button. If you see a warning, press the volume up button to continue.
5.In Odin, click the button named “PDA” and select your .tar file (your rom).
If the rom has several files, also put in the PDA, Phone/Modem and CSC files. but do NOT put in a .pit file.
6.Connect the phone to the computer with usb cable, and wait till ID:COM turns yellow.
7.Click the “Start” button, and Odin will flash your rom.
As simple as that.
I have the files however CANNOT get windows to detect the phone....it simply refuses every single time.
All i get is USB Device Not Recognised
Which i get after holding down, Power, Vol Down and Menu till i get the download screen. Occassionally (VERY RARELY) it has been detected by odin then fails on factory
UKVampire said:
I have the files however CANNOT get windows to detect the phone....it simply refuses every single time.
All i get is USB Device Not Recognised
Which i get after holding down, Power, Vol Down and Menu till i get the download screen. Occassionally (VERY RARELY) it has been detected by odin then fails on factory
Click to expand...
Click to collapse
How to use ODIN
Open odin load firmware
Put phone to download mode and read instructions yes/no
Connect Samsung usb cable .
Start in Odin
A fail during firmware flash is often a faulty download or wrong firmware for the phone .
PC does not see phone usually USB driver problem try another PC Kies must not be running occasionally fxxxd phone .
je
UKVampire said:
I have the files however CANNOT get windows to detect the phone....it simply refuses every single time.
All i get is USB Device Not Recognised
Which i get after holding down, Power, Vol Down and Menu till i get the download screen. Occassionally (VERY RARELY) it has been detected by odin then fails on factory
Click to expand...
Click to collapse
Are you plugged directly into a port on the PC, and not through a keyboard pass-through port, or a USB hub? Or have you tried a different cable?
Ok guys,
I have got it to the point it is able to flash now. Problem is I have some dodgy yellow ! and it wont go any further than that.
How do I get rid of that and get back to bog standard everything, I have used CheckFus and downloaded the firmware but it wont get rid of the !
UKVampire said:
Ok guys,
I have got it to the point it is able to flash now. Problem is I have some dodgy yellow ! and it wont go any further than that.
How do I get rid of that and get back to bog standard everything, I have used CheckFus and downloaded the firmware but it wont get rid of the !
Click to expand...
Click to collapse
Gonna need a little more detail than that. Yellow triangle at boot under where it says "Samsung Galaxy SII"? It's not really clear.
Sent from my GT-I9100 using XDA
Don't worry )
I have fixed it and am back to being on default software with no problems at all
Thanks for all the help on this forum

recovery

i have tried holding down the volume rocker and power, as well as the up and power, and down and power, but it just keeps on starting up. is there any other way to get into recovery mode?
What phone do you have?
On AT&T SGSII SGH-I777 the correct button combination is vol+ vol- and Pwr.
Hold down all three buttons until the boot screen appears, goes black, and appears a second time. (In case it doesn't boot into recovery on the first screen.)
sniper8752 said:
i have tried holding down the volume rocker and power, as well as the up and power, and down and power, but it just keeps on starting up. is there any other way to get into recovery mode?
Click to expand...
Click to collapse
Impossible to offer any reliable assistance without knowing things like whether or not you're rooted, if rooted which ROM/kernel you're using, etc.
it continues to boot. could something be corrupt? is there another way to get around this?
i have gt-i9100 installed. it was i777 before.
sniper8752 said:
it continues to boot. could something be corrupt? is there another way to get around this?
i have gt-i9100 installed. it was i777 before.
Click to expand...
Click to collapse
If you flashed firmware for the I9100 by mistake, and the firmware contained the secondary bootloader, then the button configuration would be different than the I777. Is that what happened?
If so, then you should flash the full stock UCKH7 firmware which includes bootloaders which you can get from the Download Repository. See the link in my signature.
This is what i believe is happening. i don't believe that my phone is rooted though. i don't see any superuser apps.
If you flashed an I9100 firmware by mistake using Odin, you would almost certainly not be rooted.
Anyway, if that is what has happened to your phone, then you need to use Odin to flash back to fully stock UCKH7 Gingerbread using the full firmware flash that contains secondary bootloader and param.lfs files. You can find that in the Download Repository. If you need more assistance, just ask.
so i use this site: http://forum.xda-developers.com/showpost.php?p=20229527&postcount=46 ? if so, which one do i use?
and thanks so much for your help! i appreciate it.
Flash the firmware under the heading I777UCKH7-CL503881 Stock Binaries. You can use either the one-click downloader or the tar.md5 file. The one click downloader is easier.
i noticed there is only a .exe. i ran this, and clicked on start, and it just said this:
<OSM> All threads completed. (succeed 0 / failed 0)
My phone is plugged in and on.
Open the exe file on your desktop. Then put the phone into download mode by:
with the phone off, hold down vol+ and vol- while plugging in the usb cable. Odin should recognize your phone. Then press start.
i don't think that three-button combo worked for me. it turns on the sg2 logo, then black screen, then the logo again, and then boots up normally.
It's not 3 buttons. vol+ and vol- but not power.
Here are the complete flashing instructions. Follow them step by step, and in order. This is for stand-alone odin, but applies to the one-click version as well, except you can ignore the steps about choosing the file, what to check, etc.
______________________________________________________________
How to use stand-alone Odin3 to flash firmware:
Follow and recheck each of the following steps. Do them in order listed, as some steps are dependent on previous steps. Instructions are for Odin3 v1.85. It should work with any version of Odin, but some details, like color of items, may be different. (Skip steps 6 to 8 with one-click downloader.
1.) Open Odin on the Windows Desktop.
2.) Have the USB cable plugged into USB port on the computer, but *Not* plugged in to the phone.
3.) Shut the phone off.
4.) While holding down the vol+ & vol- keys, plug micro-usb plug into phone.
5.) In Odin, you should get the yellow box under where it says ID:COM with the text 0:[COMx], and in the Message area, <ID:0/00x> Added!! where x is some number, usually 1-8.
6.) In Odin, make sure Auto Reboot and F. Reset Time are checked and all other items are not checked.
7.) Click on the PDA button. Browse to the tar file you want to install and select it so its path appears in the text edit box next to the button.
8.) Make sure the check box next to the PDA button is checked.
9.) Click the Start button.
10.) You should see the green progress bar advancing.
Let me know if it flashes successfully.
not getting the yellow bar. it just shows the charging sign on my phone. :/
Yes of course. I'm moving too fast and not thinking.
You flashed I9100 secondary bootloader. Your recovery button combination is changed. Your download mode button combination is also changed.
OK. You can get a usb jig to put your phone into download mode. If you don't have one, you can buy one on the net.
Or... you can also boot into download mode using "adb reboot download". I havn't used this method to start an Odin flash, but I presume you would use adb to put the phone into download mode, unplug the usb cable, close the command prompt, open Odin and plug the usb cable back into the phone.
If you are unfamiliar with adb, here is a pretty good place to start learning about it.
hm, could i do this?:
BUT WHAT IF I’M/YOU’RE TRYING TO GET TO CLOCKWORKMOD RECOVERY?
1 ) Before the above you should have downloaded ROM Manager from the Android Market and Flashed ClcockworkMod REcovery. When it ask you what version you should select “Samsung T-Mobile GalaxyS2.” I know it says T-Mobile but select it anyways.
2 ) From Rom Manager you can select Reboot into Recovery OR you can turn your phone off and follow my previous top instructions.
http://forum.xda-developers.com/showthread.php?t=1409769
No. Never use rom manager on the I777.
Edit: That link is from I727 Skyrocket forums. I sure hope your phone is I777 not I727. That's what you said earlier.
Another way to try to get into download mode:
Remove the battery. Hold down one or both of the volume buttons and plug in the usb cable. The usb connection will supply the power. Try that while you have odin open on the pc, and see if it gets you into download mode.
it worked!!!!
where is the tar file?
i just didn't apply any file for 1.81. what does it do, by the way, with no file selected?
If you used the one-click downloader, the firmware and Odin are both contained in the exe file, so you don't have to add anything. If you pressed start, and Odin reported success, then you flashed the firmware.

Rooted SGH i777 Won't Boot After Factory Reset

I decided to do a factory reset on my rooted SGH i777. When I did the factory reset, the phone was plugged into my computer. Now when I turn on the phone I see the Samsung Galaxy logo and then the screen goes black (no backlight) and the phone is completely unresponsive. Is there any hope to save my phone?
US variants have their own specific fora, your thread belongs here. I've asked mods to move it for you, sit tight until they do. Generally speaking (and this is the only advice I'm prepared to give you as I don't have your specific device, but the advice holds true for all Samsung phones), if you don't have download or recovery modes, you're probably boned.
I'm sure other people will suggest a few 'longshot' things you can try which might have a very very rough chance of working when your thread gets moved to the right place though.
I'd say there is a fairly good chance...
Can you boot into download mode? If so, then it's very likely. Just flash the stock firmware with Odin. You can download the necessary firmware file from the Download Repository. If you need any additional help, just ask.
creepyncrawly said:
I'd say there is a fairly good chance...
Can you boot into download mode? If so, then it's very likely. Just flash the stock firmware with Odin. You can download the necessary firmware file from the Download Repository. If you need any additional help, just ask.
Click to expand...
Click to collapse
I can't boot into recovery or download mode.
dave455 said:
I can't boot into recovery or download mode.
Click to expand...
Click to collapse
Are you using the right button combo? Power+both volume keys.
dave455 said:
I can't boot into recovery or download mode.
Click to expand...
Click to collapse
Generally, a hard bricked phone is one that exhibits no signs of life. If there are any signs of life, buttons light up, boot screen appears, screen flickers, etc, then it is not hard bricked, and is probably recoverable. But first, you need to get it into download mode.
If the phone is hard bricked, you can get it back with jtag repair from a reputable shop such as Mobile Tech Videos.
There are several ways to put the phone into download mode. You should try all of them that you can before you give up.
Recovery mode:
With the phone off (and not connected to the computer), and battery installed, hold all three buttons, vol- vol+ pwr continuously until the initial boot screen appears the second time.
Download mode:
1. With the phone off and connected to the computer via USB cable, and battery installed, hold all three buttons, vol- vol+ pwr.
2. With the phone off and battery installed, hold vol- and vol+ (but not pwr) while plugging in the USB cable.
3. With the phone off and battery installed, hold vol- (but not vol+ or pwr) while plugging in the USB cable.
4. Attempt each of the above three options with the battery removed from the phone. The computer will supply the power to the phone.
5. Use Android Debug Bridge (adb) which will only work if USB debugging has been already turned on in Developer Options, since you can't boot into the system to turn it on. With the battery installed and the phone connected to the pc via USB cable, use the command "adb reboot download".
6. Use a USB jig. With the battery installed insert the USB jig into the USB connector of the phone. Some have reported that this method works when no other method would work.
Thanks for that fantastic explanation!
This worked for me:
2. With the phone off and battery installed, hold vol- and vol+ (but not pwr) while plugging in the USB cable.
Now, how do I fix my phone with download mode?
Do I need to put a factory firmware image back onto the phone? It currently has rooted firmware that was working perfectly fine until I did a factory reset.
I would suggest that you flash the latest stock firmware, I777UCMD8 (Android 4.1.2 Jelly Bean) which you can download from the Download Repository. After flashing that you can root using the Framaroot application using the Aragorn exploit.
If you want custom firmware, once rooted you can install either Mobile Odin lite or Mobile Odin Pro and flash a custom kernel which has ClockworkMod Recovery. Following that, you can flash any firmware of your choice.
To get you started, and in case you need them, here are the directions for using Odin to flash the stock firmware (copy and paste):
How to use stand-alone Odin3 to flash firmware:
Follow and recheck each of the following steps. Do them in order listed, as some steps are dependent on previous steps. Instructions are for Odin3 v1.85 (recommended). It should work with any version of Odin, but some details, like color of items, may be different.
1.) Open Odin on the Windows Desktop.
2.) Have the USB cable plugged into USB port on the computer, but *Not* plugged in to the phone.
3.) Shut the phone off.
4.) While holding down the vol+ & vol- keys, plug micro-usb plug into phone.
5.) In Odin, you should get the yellow box under where it says ID:COM with the text 0:[COMx], and in the Message area, <ID:0/00x> Added!! where x is some number, usually 1-8.
6.) In Odin, make sure Auto Reboot and F. Reset Time are checked and all other items are not checked.
7.) Click on the PDA button. Browse to the tar file you want to install and select it so its path appears in the text edit box next to the button.
8.) Make sure the check box next to the PDA button is checked.
9.) Click the Start button.
10.) You should see the green progress bar advancing.
11.) Once the flash is complete, the phone will reboot into system.
Thanks!
With your help, I was able to recover my phone. Thank you! I will be using stock firmware. Last time I had my phone rooted, it was so slow it was unusable.

[Q] Stuck on Samsung screen

Samsung Galaxy S 2 AT&T
Jellybean
Rooted about 3-4 months ago
The phone was fully charged and on the arm of the chair in my peripheral vision. I saw the Samsung logo come on and since then nothing has changed. I can't go into any mode (vol+, vol-, pwr). Cable connection to the computer shows no response that anything is connected to the computer. I took it to AT&T and they said there were issues with the last update that caused irreparable issues. (Of course they want to sell me the latest and greatest) I got a new S 5 but I would like to pass the S 2 to my daughter. I didn't lose any apps, pics or data. I just want it back to stock + rooted.
Any help would be greatly appreciated!
Just to be sure, are you holding vol +, vol -, pwr until you see the samsung logo the SECOND time?
It isn't always necessary to wait the second cycle, but it ensures that the key command is correctly registered by the phone.
dbur0727 said:
Samsung Galaxy S 2 AT&T
Jellybean
Rooted about 3-4 months ago
The phone was fully charged and on the arm of the chair in my peripheral vision. I saw the Samsung logo come on and since then nothing has changed. I can't go into any mode (vol+, vol-, pwr). Cable connection to the computer shows no response that anything is connected to the computer. I took it to AT&T and they said there were issues with the last update that caused irreparable issues. (Of course they want to sell me the latest and greatest) I got a new S 5 but I would like to pass the S 2 to my daughter. I didn't lose any apps, pics or data. I just want it back to stock + rooted.
Any help would be greatly appreciated!
Click to expand...
Click to collapse
cyril279 said:
Just to be sure, are you holding vol +, vol -, pwr until you see the samsung logo the SECOND time?
It isn't always necessary to wait the second cycle, but it ensures that the key command is correctly registered by the phone.
Click to expand...
Click to collapse
I tried again making sure to release all buttons when I saw the logo the second time. I also tried again releasing the pwr button only. Nothing is working.
You need to see if the phone will go into download mode. There are several ways to put the phone into download mode. You should try all of them that you can before you give up.
Download mode:
1. With the phone off and connected to the computer via USB cable, and battery installed, hold all three buttons, vol- vol+ pwr.
2. With the phone off and battery installed, hold vol- and vol+ (but not pwr) while plugging in the USB cable.
3. With the phone off and battery installed, hold vol- (but not vol+ or pwr) while plugging in the USB cable.
4. Attempt each of the above three options with the battery removed from the phone. The computer will supply the power to the phone.
5. Use Android Debug Bridge (adb) which will only work if USB debugging has been already turned on in Developer Options, since you can't boot into the system to turn it on. With the battery installed and the phone connected to the pc via USB cable, use the command "adb reboot download".
6. Use a USB jig. With the battery installed insert the USB jig into the USB connector of the phone. Some have reported that this method works when no other method would work.
creepyncrawly said:
You need to see if the phone will go into download mode. There are several ways to put the phone into download mode. You should try all of them that you can before you give up.
Download mode:
1. With the phone off and connected to the computer via USB cable, and battery installed, hold all three buttons, vol- vol+ pwr.
2. With the phone off and battery installed, hold vol- and vol+ (but not pwr) while plugging in the USB cable.
3. With the phone off and battery installed, hold vol- (but not vol+ or pwr) while plugging in the USB cable.
4. Attempt each of the above three options with the battery removed from the phone. The computer will supply the power to the phone.
5. Use Android Debug Bridge (adb) which will only work if USB debugging has been already turned on in Developer Options, since you can't boot into the system to turn it on. With the battery installed and the phone connected to the pc via USB cable, use the command "adb reboot download".
6. Use a USB jig. With the battery installed insert the USB jig into the USB connector of the phone. Some have reported that this method works when no other method would work.
Click to expand...
Click to collapse
Okay. I was successful using option 1. However, I installed the SIM card (for my daughter's phone) and it has been stuck on "Downloading..." for around 6 hours or so. Should I have downloaded a stock OS or something? Is it waiting for me? Is it pulling the factory default OS OTA?
dbur0727 said:
Okay. I was successful using option 1. However, I installed the SIM card (for my daughter's phone) and it has been stuck on "Downloading..." for around 6 hours or so. Should I have downloaded a stock OS or something? Is it waiting for me? Is it pulling the factory default OS OTA?
Click to expand...
Click to collapse
Sorry I didn't include more information in my previous post. Putting the phone into download mode just lets us know that the phone can be recovered, but it doesn't do anything by itself. The process of recovery is to use the Odin program to install a fresh stock firmware onto the phone. Since you appearantly are unfamiliar with the process, I will explain in detail.
First, download the stock 4.1.2 Jellybean Full distribution, I777UCMD8 from the Download Repository. (link in my signature) It's the next to last item near the bottom. The downloaded file is in seven-zip (.7z) format and you need to extract the contents using an archiving program. The resulting file, which will have a ...tar.md5 extension, is the file you will use in step 7 below. Also download Odin3 v1.85. There is a link near the top of the page in the Repository.
How to use stand-alone Odin3 to flash firmware:
Follow and recheck each of the following steps. Do them in order listed, as some steps are dependent on previous steps. Instructions are for Odin3 v1.85. It should work with any version of Odin, but some details, like color of items, may be different.
1.) Open Odin on the Windows Desktop.
2.) Have the USB cable plugged into USB port on the computer, but *Not* plugged in to the phone.
3.) Shut the phone off.
4.) While holding down the vol+ & vol- keys, plug micro-usb plug into phone.
5.) In Odin, you should get the yellow box under where it says ID:COM with the text 0:[COMx], and in the Message area, <ID:0/00x> Added!! where x is some number, usually 1-8.
6.) In Odin, make sure Auto Reboot and F. Reset Time are checked and all other items are not checked.
7.) Click on the PDA button. Browse to the tar file you want to install and select it so its path appears in the text edit box next to the button.
8.) Make sure the check box next to the PDA button is checked.
9.) Click the Start button.
10.) You should see the green progress bar advancing.
11.) When complete, you will get a PASS (or FAIL if unsuccessful).
Since you are unable to get into recovery mode now, you may have to enter recovery after the firmware flash is successful if it won't boot on the first try. Use the instructions earlier in the thread to enter recovery, and perform a wipe data/factory reset.
Once you have the phone up and running, Framaroot with the Aragorn exploit is the easiest way to root.
If you need further help or instructions, feel free to ask.

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