I attempted to flash a different stock firmware (BTU XXEMG4) via Odin on my completely stock I9300 s3 running Vodafone Germany XXELLA 4.1.2. Odin said it passed, but it booted straight into a boot loop.
When I got it (supposedly new), it was running stock Vodafone Germany firmware, but, in recovery, it said the CSC code was EUR, which I read was Greece. Otherwise, I have no idea about the origins of the phone. I've had it for almost two and a half years.
My goal with flashing was to remedy my frequent freezes caused by the SDS fix. I'd read that XXEMB5 handled it the best, and since XXEMG4 was even newer, I went with that. I was then planning on trying the dummy file generator to deal with any remaining freezes. I also wanted plain BTU software, free of useless Vodafone apps (I'm in the U.S. on Tmobile). I was planning to root after I was done with this project.
I CAN boot into both recovery and download mode, so I've tried the following:
-Wiping cache in recovery
-Factory reset in recovery
-Reflashing the firmware and other firmwares with Odin (BTU XXEMB5, Vodafone Germany XXEMRH, etc.) (It said passed every time, but still in a boot loop)
-Firmware upgrade and initialization through Kies (It prepared the upgrade, but never started it and then Kies stopped responding) (tried it while the phone was in both download and recovery mode)
-Pulling the battery and sim out for a while
There are no errors in recovery mode. I read a bit about efs partitions and how if it was wiped, your phone might not turn on. But, everyone seemed to get an error in recovery mode when that happened, so, I don't think that's the problem.
I'm scared the answer might be to take it in for service because I don't think there's anywhere local to bring it in, and I would rather not send to Samsung. It never had a warranty in the first place, so I would be paying for the service, which I don't mind. But, I'm scared they might just send me a refurbished one instead of actually repairing mine. I'm quite attached to this phone, I don't want a different one.
Try the rescue firmware and pit file, search general forum for the thread.
Flash both together at the same time then factory reset in recovery before first boot.
It sounds like your phone has advanced nand memory wear, so don't expect too much.
Thanks for your reply! Is this the rescue firmware and pit file you are referring to?
http://forum.xda-developers.com/showpost.php?p=30087735&postcount=6
So I flashed this rescue firmware and pit file http://forum.xda-developers.com/show...35&postcount=6 (the xxemg4 KOR one) and still the same result - Odin says passed, but still boot loop. Is it really just a service center for my phone now?
If a factory reset doesn't cure then there isn't much else to try, an AOSP based custom rom might be worth a go as they use the hardware differently.
Related
I'm hoping someone can tell me the exact filenames of the rom and or kernel I need to restore my Galaxy S2 to stock rom for O2 UK.
I've tried various UK ones from this thread and flashed using Odin. But all that happens is a boot loop everytime. The recent one I tried was I9100XWKE1_I9100XXKDJ_I9100O2UKE1_HOME.tar
but as mentioned, all I get is a boot loop.
Can anyone assist?
It shouldn't matter which O2 rom you use. Only you're going to know exactly what firmware was on your phone when you bought it, but again, that's not important.
Frankly, if it were me, I'd get the latest stock firmware available for phone model/country/carrier with the PC version of Checkfus (search for it on here/Google) & do it that way. Just my 3 shekels worth.
But before you go down that path, have you tried a factory reset ? If you have & it didn't fix the bootloop, then the Checkfus route is worth considering. You get one file which you flash in PDA section of Odin & done.
Thanks for that. I tried the software and downloaded the exact rom to use for my country and network. I flashed it in Odin but again, it sticks at the boot logo. Not so much of a boot loop but just stays on the animated S logo.
O2 UK simple KDD was the first one posted in the branded provider roms thread .
But why not use your original saved firmware ??? or at least search for that one as non but you knows for sure what it was .
Clean Slate for those that balls up the firmware .Or need to return to service or decide if its hardware/firmware problem .
Backup data first if phone is working .
Boot CWM recovery
Mounts and Storage
Format cache data system sd card .
Remove battery
Boot to download mode
Open Odin
Install correct stock firmware .
Still problems use usb jig to set rom counter to zero .
Return to service centre .
jje
I'm stunned.
All these roms I tried and the whole issue was not wiping cache etc. Now I've done it, seems to be working. Finger crossed. Thanks for pointing me in the right direction.
Nothing is wrong with your rom, what you do now is put it in download mode, flash cf-root, go into cwm, wipe factory,cache, and dalvik cache, then turn on device leave it for at least 12 mins (sometimes it just boot loops for awhile and works, it happened to me before, after it happens once it wont happen ever again), for more info read my signature, cf-root is labeled chainfire
Hi - I tried posting this in Development where I thought it should go but I haven't posted at all before so it won't let me.
I've gotten myself into a very messy (and probably stupid) situation with firmware with my I9300 - there's a very real chance I think that it is non-recoverable, but if anyone could give me some advice on what else to try I would be extremely grateful!
My problem:
Galaxy S3 I9300 16gb international won't boot - stuck at Device Name screen.
Won't boot into recovery
Will boot into download mode
Odin connects to device, but trying to flash stock ROM freezes at 'NAND Write Start!' or just FCs ("Odin has stopped working" reported by Windows
Heimdall won't recognise my device (does it even work with the s3? I don't know) so I can't print a PIT or anything
How I got here (over about 4 weeks):
Started with I9300 16gb international version (Grey import from Hong Kong to Australia, booted in French but let me change to English)
Gained root access through CWM touch kernel and Odin
Flashed AOKP Milestone 6 ROM
Used 'Secure Settings' (app) and 'Locale' (app) to set up a lockscreen PIN that enabled and disabled dynamically according to location rules (worked pretty well!)
Decided I wanted to encrypt my device
Clicked through all warnings, followed instructions to set PIN (didn't disable Secure Settings, the app that allowed the lockscreen changes outlined above)
Encryption successful, booted successfully using the PIN set
Lockscreen goes funny - 'quick PIN' option in AOKP (where you don't have to press OK after entering the PIN correctly) stops working
Any PIN at all at this point will unlock my device
Reboot to discover that my original encryption PIN has stopped working
Seriously, I tried it like 20 times including slight variations in case I mistyped, and other PINs that I use in case I misremembered
Rebooted into CWM to try to flash a new ROM
Can't access internal SD due to encryption
Use Galaxy S3 Toolkit to 'download and flash new stock rom, kernel using Odin'
Didn't know which firmware to download so i went with option 5 (GT-I9300_BTU_I9300XXALF2_I9300OXAALF2_I9300XXLF2)
Odin connects sucessfully, flashes device
Device reboots into 'Trouble with firmware upgrade - connect to samsung kies to fix' (or whatever it says)
Download and install Kies (i had the USB drivers for the phone installed previously)
Kies won't recognise my phone on any level for emergency recovery
Decide that the internal SD card encryption is causing the problems, and that maybe I need to repartition
Don't notice all the warnings about repartitioning
Download PIT files for I9300 from somewhere
Try reflashing ROM using one of these PITs (I didn't know any better so I just used GT-I9300_mx_20120329.pit, which in retrospect is probably for a device with different internal storage size)
Phone stopped giving me 'Firmware update problem' screen and started going to the 'GT I9300' booting screen, but never got past that point
Repeat ad infinitum - I've tried flashing several different stock ROMs, using several PITs and am now at the point mentioned above.
Only other information I have really is that on the back cover behind the battery it says 'Model GT-I9300' and 'SSN-I9300GSMH' if those are important.
Other forums seem to indicate that I have a NAND read/write issue, but trying to flash a stock kernel (which was the advice given) results in... 'NAND write start!' freeze :\
Like I said, I have no idea if this is recoverable in any way at this point, but if anyone has any ideas I'd love to hear them!
Thanks
Hi. This probably wont help, but try to use fresh odin download and other pc with new drivers installed without Sam Kies. older versions of odin did not worked with mine s3 and I had green screen while flashing problems when I used my old laptop to flash. Fresh pc with fresh drivers did the trick
dingo dog said:
Hi. This probably wont help, but try to use fresh odin download and other pc with new drivers installed without Sam Kies. older versions of odin did not worked with mine s3 and I had green screen while flashing problems when I used my old laptop to flash. Fresh pc with fresh drivers did the trick
Click to expand...
Click to collapse
Hi - Thanks for the tip, but I already tried with my wife's laptop. Should have mentioned in the original post.
Thanks again.
Older versions of Odin do work on SGS3 .
evelopment where I thought it should go but I haven't posted at all before so it won't let me.
Development only posts not Q&A nothing to do with 10 posts .
Two thoughts could be the usual flashed multiple stuff and phone is confused plus wrong PIT file flashed .
Thats just firmware not hardware problem .
Or indeed at some stage Nand is corrupt .
Solution would be
Try correct PIT file first before a repair centre .
jje
Just wanted to say that I have the same problem, but mine is even more strange. I can boot into the system but I have to disable wifi and mobile data right away otherwise the phone will reboot after a couple of seconds. I see the phone if I connect it to the computer but I can not write or read the files on the phone. But I tried the toolbox and could push an apk to the phone.
CWM works but if I try to wipe or flash another rom it reboots, some stuff works and other just reboots the phone.
Download-mode works and Odin finds the phone but everything I have tried fails. I have tried standard stock firmware, 3 part firmware and PIT but it always hangs on NAND Write.
If anyone has some solution I would be thrilled.
Bananafische said:
I've gotten myself into a very messy (and probably stupid) situation with firmware with my I9300 - there's a very real chance I think that it is non-recoverable
My problem:
[*]Won't boot into recovery
[*]Will boot into download mode
[*]Odin connects to device, but trying to flash stock ROM freezes at 'NAND Write Start!' or just FCs ("Odin has stopped working" reported by Windows
[*]Heimdall won't recognise my device (does it even work with the s3? I don't know) so I can't print a PIT or anything
Thanks
Click to expand...
Click to collapse
It can be solved using Odin if you get the official and correct Stock ROM for your SGS3. And/Or you might have been using the Wrong PIT.
And finally, No idea about heimdall ;p
Try this process: Samsung Galaxy S3 Not Booting? Here’s The Solution You can get detailed instructions here and that .PIT file too.:angel:
theonlyanil said:
It can be solved using Odin if you get the official and correct Stock ROM for your SGS3. And/Or you might have been using the Wrong PIT.
And finally, No idea about heimdall ;p
Try this process: Samsung Galaxy S3 Not Booting? Here’s The Solution You can get detailed instructions here and that .PIT file too.:angel:
Click to expand...
Click to collapse
It worked!
PIT flash successful, then stock rom restored
I still needed to go in to stock recovery and do a factory reset from there to undo the encryption.
Thanks so much for everyone's help.
I am glad that It worked for you
I am still stuck, I am guessing that if none of the PIT´s work then it is officially bricked?
u didn't try the link posted by me?
theonlyanil said:
u didn't try the link posted by me?
Click to expand...
Click to collapse
it dosen't work ,stop at Get PIT for mapping..
help me
Hy guys Im from Hungary and i would like to flash my i9300 tmobile phone. My question is: can i flash the poland xeo to it or i just have to wait for the official tmobile rom? Thank you!
Where did you got the pit file
Bananafische said:
It worked!
PIT flash successful, then stock rom restored
I still needed to go in to stock recovery and do a factory reset from there to undo the encryption.
Thanks so much for everyone's help.
Click to expand...
Click to collapse
Where did you got the pit file
Hello, the PIT Flash didn't work for me either.
I was CF-rooted while overseas and stupidly forgot to disable auto-updates. The tricky part was that the auto update probably was for a different region as I was in Europe when the brick happened, but I live in Singapore.
Have tried to flash the firmware several times using Odin and even the PIT but all have been unsuccessful. I've been stuck a "Firmware upgrade encountered an issue....".
Have been able to get to the download screen but not the recovery mode.
Any pointers or is my phone rightly bricked?
I fixed my half brick using Android 4.0.4 ICS XXLAF2 stock firmware
My old stuff is still on my sd card, but not usable tho :s
Any tips? cant seem to restore with rom manager. It only fails
Help with encrypted at&t GS3
theonlyanil said:
It can be solved using Odin if you get the official and correct Stock ROM for your SGS3. And/Or you might have been using the Wrong PIT.
And finally, No idea about heimdall ;p
Hey Anil,
I have encrypted at&t samsung gs3 running CM10.1 nightly. For some reason I cannot undo the encryption. I want to use the method described on this link that you posted here to get rid of encryption.
I have downloaded official firmware from sammobile. But the .pit file available on that site is for internation version. I have at&t GS3 so i should be using the .PIT for at&t version. Could you please provide me .PIT for 16GB at&t Samsung galaxy s3, if you have one or you know the link? Ii appreciate your help.
please help me with this man.
-Ravi
Click to expand...
Click to collapse
Worked well
The method given by Anil worked fine.
And since my device was encrypted before, it asked me password after installing the firmware by Odin.
So for this I just entered recovery (Sam recovery) and did a factory reset, and the encryption was removed.:good:
Dude don't post ur serial or imie
Bananafische said:
Hi - I tried posting this in Development where I thought it should go but I haven't posted at all before so it won't let me.
I've gotten myself into a very messy (and probably stupid) situation with firmware with my I9300 - there's a very real chance I think that it is non-recoverable, but if anyone could give me some advice on what else to try I would be extremely grateful!
My problem:
Galaxy S3 I9300 16gb international won't boot - stuck at Device Name screen.
Won't boot into recovery
Will boot into download mode
Odin connects to device, but trying to flash stock ROM freezes at 'NAND Write Start!' or just FCs ("Odin has stopped working" reported by Windows
Heimdall won't recognise my device (does it even work with the s3? I don't know) so I can't print a PIT or anything
How I got here (over about 4 weeks):
Started with I9300 16gb international version (Grey import from Hong Kong to Australia, booted in French but let me change to English)
Gained root access through CWM touch kernel and Odin
Flashed AOKP Milestone 6 ROM
Used 'Secure Settings' (app) and 'Locale' (app) to set up a lockscreen PIN that enabled and disabled dynamically according to location rules (worked pretty well!)
Decided I wanted to encrypt my device
Clicked through all warnings, followed instructions to set PIN (didn't disable Secure Settings, the app that allowed the lockscreen changes outlined above)
Encryption successful, booted successfully using the PIN set
Lockscreen goes funny - 'quick PIN' option in AOKP (where you don't have to press OK after entering the PIN correctly) stops working
Any PIN at all at this point will unlock my device
Reboot to discover that my original encryption PIN has stopped working
Seriously, I tried it like 20 times including slight variations in case I mistyped, and other PINs that I use in case I misremembered
Rebooted into CWM to try to flash a new ROM
Can't access internal SD due to encryption
Use Galaxy S3 Toolkit to 'download and flash new stock rom, kernel using Odin'
Didn't know which firmware to download so i went with option 5 (GT-I9300_BTU_I9300XXALF2_I9300OXAALF2_I9300XXLF2)
Odin connects sucessfully, flashes device
Device reboots into 'Trouble with firmware upgrade - connect to samsung kies to fix' (or whatever it says)
Download and install Kies (i had the USB drivers for the phone installed previously)
Kies won't recognise my phone on any level for emergency recovery
Decide that the internal SD card encryption is causing the problems, and that maybe I need to repartition
Don't notice all the warnings about repartitioning
Download PIT files for I9300 from somewhere
Try reflashing ROM using one of these PITs (I didn't know any better so I just used GT-I9300_mx_20120329.pit, which in retrospect is probably for a device with different internal storage size)
Phone stopped giving me 'Firmware update problem' screen and started going to the 'GT I9300' booting screen, but never got past that point
Repeat ad infinitum - I've tried flashing several different stock ROMs, using several PITs and am now at the point mentioned above.
Only other information I have really is that on the back cover behind the battery it says 'Model GT-I9300' and 'SSN-I9300GSMH' if those are important.
Other forums seem to indicate that I have a NAND read/write issue, but trying to flash a stock kernel (which was the advice given) results in... 'NAND write start!' freeze :\
Like I said, I have no idea if this is recoverable in any way at this point, but if anyone has any ideas I'd love to hear them!
Thanks
Click to expand...
Click to collapse
For ur own safety mate
Flashed Xperia's miui rom on S3-i9300
I have flashed Xperia's miui rom on S3-i9300, stack on boot what can i do? I did everything on the video.
xcanpolatx said:
I have flashed Xperia's miui rom on S3-i9300, stack on boot what can i do? I did everything on the video.
Click to expand...
Click to collapse
Before you pay for a repair you can try flashing stock rom via Odin .
So my international i9300 16gb is stuck on a boot loop.
I've always been running stock and no root.
The problems started a couple of weeks ago with the phone freezing up and only being able to reboot by removing the battery.
The last time it froze it just didn't boot up again.
I've tested almost everything. I can flash stock rom through Odin, but some other roms wont write.
After a successful flash of stock rom the boot loop remains and I can only enter Download mode.
I can get in to CWM but the /data folder wont mount. EFS, system and cache seems ok.
I've tried re-partitioning with 3 different pit-files (strangely the one for the 32gb version is what makes me able to get into CWM)
Please tell me it's dead so I can stop wasting time on this ****.
Sounds like SDS, were you running the latest stock rom or an older version? In download mode is there anything in product name?
You probably need a repair, to replace the motherboard.
Sent from my GT-I9300 using Tapatalk
Don't think it was the latest stock rom, was a long while ago I got an OTA update.
In download mode it says:
Odin mode
Product name: GT-i9300
Every rom i try gets to the boot animation and then freezes and/or loops.
Any idea what hardware is causing this?
Edit: Solved!
Got lucky with one of the oldest stock roms from my carrier, made it into the recovery mode and wiped. After that it booted up so I tried cyanogenmod and it works!
Sudden Death Syndrome. The motherboard is failing. Try repairing the motherboard.
If you are still under warranty, Samsung is very cooperative and may replace it for free, even if rooted.
I flashed a few roms like PACman and SHOstock and it booted up but it seems that it was lagging quite badly and camera showed a black screen. I thought it was the phone's camera that was broken. I flashed the UCLE5 rooted found here: http://forum.xda-developers.com/showpost.php?p=20229527&postcount=46 and it booted up just fine. However, camera crashes when I tried to take a picture (atleast it's not a black screen now) and it randomly crashes and reboot.
When I tried to flash UCKH7, I get stuck on the "Rethink Possible" screen and did not get anywhere else.
Can anyone help me? I bought this phone for my brother and the previous owner flashed some stuffs already so I just want it back to its original state with stock before going forward with custom roms..
Boot into recovery. With the phone off, hold all three buttons, vol+ vol- pwr, until the initial screen shows, goes black and shows again, then release buttons. Once in stock recovery, perform a wipe data/factory reset. After this, the phone should boot. Then test the camera to see if it is working correctly, and test other functions of the phone.
Does the previous owner say the phone was working fully functional before you got it?
If you get the phone to boot and working correctly, then you should flash the latest stock firmware which is UCMD8, or a good stable custom firmware. Be happy to help with that as well.
I performed the wipe in the stock recovery and it is stuck at the "Rethink Possible" screen. Only time that I got it to boot was to load the UCLE5. UCKK6 and UCKH7 didn't boot for me. I will try the UCMD8 but I don't understand why 1 stock would boot while the other one didn't.
Previous owner said it was working okay for him but he didn't know about the phone being rooted and made some kind of update or changes to the phone (software wise). I'm guessing he flashed it weirdly or something like that. I saw the count as 25 when I got into the "download recovery" portion to flash UCLE5 through ODIN. Maybe he flashed it wrongly and it has messed something up.
Since a wipe data/factory reset will not clear the problem, it is safe to assume that there is some issue with memory. Since your were able to get the phone to boot at least once, but it was not functioning normally, it is fairly safe to assume that the memory is not permanently damaged. Based on these assumptions, I would guess that there may be nand read/write corruption. My reasoning may be incorrect, but it is sensible to try to clear the nand r/w corruption next to see if that will clear up the issues.
Instructions to clear nand read/write corruption. It is critical to follow these steps in order.
Odin3 v1.85 is recommended.
Perform a wipe data/factory reset both before, and after if needed.
1) Download the Tar version of Siyah 2.6.14 Kernel. Flash it in PDA Without ticking Re-Partitioning
2) Flash the Tar.md5 of the full stock Gingerbread distribution from the Download Repository, I777UCKH7 including the bootloaders and everything, in the PDA slot.
3) If that is successful you are done. If it is not, then:
4) Download the SBL Bootloader from the Download Repository. Flash it as PDA in ODIN, without ticking Re-Partitioning. (Please observe normal bootloader flashing caution.)
5) Flash the Kernel, as in step 1.
6) Flash the full stock Gingerbread distribution, as in step 2.
I followed all of your steps and it seems that I am still at the "Rethink Possible" screen. Even after flashing and wiping everything according to your directions.
I downloaded the "I777UCKH7-REV02-home-low-CL503881.tar.md5.7z" which I assumed was the full UCKH7 that you mentioned in your post. After flashing and wiping, it still hangs. I flashed the "I777 UCKH7 sbl.tar" and repeated step 1 and 2, wiped and it still hangs.
When I am doing a "wipe data/factory reset" I see an error under "Appling Multi-CSC".
This is what I see,
Installing Multi-CSC
Can't access to '/system/csc/ATT/system/'.
Successfully applied multi-CSC
Click to expand...
Click to collapse
Does this have anything to do with the hanging at the boot screen?
nomoney4me said:
Does this have anything to do with the hanging at the boot screen?
Click to expand...
Click to collapse
I'm not sure. Most of what I know about this phone is gained from observation of the information that people have posted in these forums over the past two and a half years. I haven't seen an issue exactly like yours, as far as I can remember. There was one case where the phone would boot into the system, but not function properly. When it was sent to Mobile Tech Videos for jtag repair, it was found to have damaged emmc memory. I just don't know whether your issue is similar to that one or not. Any further advice is beyond the scope of my understanding.
What I have seen happen a few times is that if a person keeps trying to get the phone working, eventually some operation (flash or whatever) works differently and the phone then works. This would indicate trying different equipment, as in different pc, different cable, etc. I know that the flash is completing successfully so I don't know if this is irrelevant advice or not.
Another thing to try could be re-partitioning the memory when you flash. There is an I777 pit in the download repository. I have no experience with using it, but I remember at least two cases where a phone was recovered by flashing the pit. In one case, flashing the pit with the firmware the first time didn't clear the problem, but then flashing the firmware again worked. Flashing the pit is generally considered risky, especially if you don't know exactly what the correct steps are, but at this point, what is there to lose?
Hi,
I have a S3 model GT-I9305 (2GB) for like 7 months. It had 4.3 version installed, and I wanted to downgrade to 4.1.2 or 4.2.2. In the about menu Baseband version was i9305xxuemk1. Phone does not have any recovery software installed, except the default Odin download mode (Home+Down+Power), and I am able to enter it.
Since I am not sure for which country / carrier the phone is made (here people sell everything from everywhere), I do not know the original version of ROM, and there is no official ROM for my country (sammobile / Serbia). I have tried several 4.1.2 ROMs for different zones, and almost all of them failed, except for one - I9305XXALI5_I9305EVRALI5_EVR, which is reported as successful installation in Odin, but after restart it hangs on samsung logo.
Anyone has any ideas?
So, it seems that I can install any 4.3 version, but cannot install any 4.1 version. Some fail on nand, most fail on sboot. Any ideas? Basically what I do is, put the phone into download mode, and load firmware in odin and flash it.
Don't install 4.1 roms.
After you flash in odin boot into recovery and do a factory reset and and wipe cache and delvik cache then reboot
I am not sure what you mean? My goal is to install 4.1.2 version.
I have followed instructions from this link, but it doesn't work. In final step, when I need to go into recovery mode (Up+Home+power), I cannot enter it, it just hangs on samsung logo.
However, this link helped, I was able to downgrade using Odin mobile
Goran_ said:
I am not sure what you mean? My goal is to install 4.1.2 version.
I have followed instructions from this link, but it doesn't work. In final step, when I need to go into recovery mode (Up+Home+power), I cannot enter it, it just hangs on samsung logo.
However, this link helped, I was able to downgrade using Odin mobile
Click to expand...
Click to collapse
Why do you want to downgrade all the way down to a 4.1 rom.
Are you sure you are powering off then entering the combo to start it?
Because I have a major battery drain, which last from 6-10 hours, depending on usage (mostly calls 1-2h, very rarely internet). Hard reset did not help.
As I have learned, it is a known KNOX problem, that I was not aware of (I also have another S3, which does not have KNOX on it).
Goran_ said:
Because I have a major battery drain, which last from 6-10 hours, depending on usage (mostly calls 1-2h, very rarely internet). Hard reset did not help.
As I have learned, it is a known KNOX problem, that I was not aware of (I also have another S3, which does not have KNOX on it).
Click to expand...
Click to collapse
I have just read your topic title again, im sorry but i have no knowledge of knox since the i9300 does not have it, please get a mod to move this to the i9305 section where they can help you
Could you uninstall KNOX rather than going back to 4.1.2? http://www.androidpit.com/how-to-uninstall-knox