[Q] LGP760 V20i-eur-xx unable to unlock bootloader !!! - LG Optimus L9 P760, P765, P768, P769

Hello,
I have a lg p760 L9 V20i-eur-xx which has locked bootloader and I cannot unlock it no matter what I try. Also I made the mistake to try to flash cwm recovery and now I'm stuck at Lg security error. I can still get into sw/upgrade mode but that is far as it goes. I tried so far LG flashtool, no succes, kdz flashing no succes. Smartflash no succes. It seems like nothing works. I was using win 7 x64.
Is there any feaseble way that I can recover my phone and get rid of the LG security error?
Is there any way to unlock the bootloader?
Thank you very much I know most of you are sick of it but please help me ...it's my only phone and I'm lost without it. Thanks in advance.
By the way, how can I check if my bootloader is just locked or encrypted. If it's encrypted then I believe there is no chance of succeding.

Factory reset. Simultaneously press power, menu and volume up or down, the other position bringing up recovery.
I had unlocked the bootloader long ago, but had to re-root a couple if days ago in the process of updating baseband. I could update the rooted rom with LG's service flash tool w/o losing apps and settings, surprisingly, but could not get adb to work with Win8.1 x64. Trying to invoke fastboot menu on the phone earned me the factory reset, now all was gone and still no root and no way to recover anything. No problems with adb on the netbook running Win7 x64, however.

I have an similar issue here. But somehow is triggered suddenly (means I no do nothing specially, at a time I tried to install CWRM, the QuickBoot, and after I assumed that is not clear for me how to unlock bootloader, let it as it is). But starting to Saturday I have random reboots/shutdowns, random LG security error boot screens, I performed an factory reset, and now I am stuck.
Now I am on a "S/W Upgrade" "please wait while upgrading..." from more than a half hour (initiated from LG User Support Tool.

Related

[Q] LG L9 Brick without root, locked bootloader

Hello All!
I got my LG L9 (P765) brick and need your help. It wasn't unlocked or rooted. Also it has original ROM.
It happened after ordinary phone call. The only thing i saw was "LG" lable. After all common methods i tried hard reset and got dead android on the screen with red triangle. Some hours later i flashed new boot, u-boot and recovery but nothing happens. The KDZ method was done today with no positive results after V10 and V20 instalations (even with hard resets). Custom recovery upload results in "Security Error" on title screen.
So guys please help me. What else can be done to make it load at least recovery? Is it possible to root or unlock such device?
If you have locked bl and device is nonrooted you can service your smartphone in LGe services.
L9 is hard to unlock, but you can go into LG recovery by power volume up and home, smartphone will be connected as recovery. By adb you can writte "adb reboot oem-unlock" to enter fastboot mode and unlock bootloader. If your phone will just restart, try this method few times. After you unlock bootloader you will able to flash custom recovery and chance kernel, install custom rom etc.
i have this same trouble and this is not help...

[Q] Flash clean constantly restarting rooted LG Optimus L5 (E612f)

I have an LG Optimus L5 (E612). I successfully rooted it, some three weeks ago, by following these instructions. However, as of December 25, mobile device has been acting up; the problem seems to have started when I attempted to update SuperSU. The problems:
I cannot install or uninstall apps and it constantly reboots on its own.
When mobile device reboots, it appears to go to state it was in on December 25... apps uninstalled via adb for instance reappear after device reboots
What I would like to do is completely wipe it clean, using a factory reset or some sort thing. But I am unable to do that that... This is what happens:
a normal factory reset via settings fails
a factory reset by holding volume down, power button and finally home key fails as devices restarts after about 5 seconds
attempting to using fastboot erase [cache|userdata|system] fails as device restarts as soon as I issue command
I have been attempting to flash mobile device using fastboot, but I have had little luck there as well. How do I go about resolving this issue?
lightonphiri said:
I have an LG Optimus L5 (E612). I successfully rooted it, some three weeks ago, by following these instructions. However, as of December 25, mobile device has been acting up; the problem seems to have started when I attempted to update SuperSU. The problems:
I cannot install or uninstall apps and it constantly reboots on its own.
When mobile device reboots, it appears to go to state it was in on December 25... apps uninstalled via adb for instance reappear after device reboots
What I would like to do is completely wipe it clean, using a factory reset or some sort thing. But I am unable to do that that... This is what happens:
a normal factory reset via settings fails
a factory reset by holding volume down, power button and finally home key fails as devices restarts after about 5 seconds
attempting to using fastboot erase [cache|userdata|system] fails as device restarts as soon as I issue command
I have been attempting to flash mobile device using fastboot, but I have had little luck there as well. How do I go about resolving this issue?
Click to expand...
Click to collapse
Your phone doesnt have fastboot. Backup your data and flash a KDZ.
christi9503 said:
Your phone doesnt have fastboot. Backup your data and flash a KDZ.
Click to expand...
Click to collapse
I am a newbie at all this, could you please help with links to posts and/or resources that will help me 'flash a KDZ'?
I tried flashing, but I still have not had any luck with this.
KDZ Updater: I have attempted flashing... flashing process appears successful but problem still persists;
LG Software Updater Tool: This was probably the last straw. I hooked up phone via usb, in debugging + PC Suite mode... this was a success but problem is still there
Interestingly enough, the problem goes away after booting in Safe Mode; I can uninstall apps and even gain root access via adb. However, problem resurfaces after rebooting---apps I uninstalled are restored. Any idea what I could do here?
All I want to do is clean up device so I can start on a clean slate here...

Moto E Soft Bricked

So I had a moto e with it's bootloader unlocked, and had a custom ROM running on it; however without my knowledge, someone gave the phone to a local (unauthorized )service center. I am not sure about what they did but after this incident, I get the Bootloader unlocked warning when it powers on, but then it directly goes to the fastboot menu saying that there was a fall through in the normal boot-up procedure, and 'system image validation failed'. However I was able to boot into android by rebooting a number of times. But recently, when it did boot up after several attempts the IMEI numbers were gone, so it wouldn't recognize my SIM cards.
I should also mention that the fastboot menu says that the phone is LOCKED. I tried using fastboot, but i cannot even get the unlock code info, or unlock the bootloader itself.
At this point, what do I do? Do I try flashing the same firmware again?
Thank You.
Try flashing the stock firmware :fingers-crossed: Best of Luck!
Hit Thanks if I Helped!!!!!!!!!!!

[Q] L7 II factory reset and kdz flash not working, is there a simulation mode?

Hello! I have a strange problem. Phone is P710 with open eu V10E rom. Kids played with the unlock pattern, and no data connection, phone locked, can not enter past the pattern screen.
No problem, do a factory reset! Power off, button combination, green robot appears. Reboots, and again the pattern screen with the kid smiling on the background picture...
Of course no usb debugging enabled, so we ended in normal mode.
Tried stock recovery (with the lg service picture), but no menu, just the picture. Adb is present with $ prompt, so no root, data not mounted, and cannot mount without root.
Thought i will try fastboot erase data. Tried adb reboot bootloader, but no fastboot, just reboots to the pattern screen. Strangely adb reboot recovery also does'nt boot back to recovery, but to normal pattern lock screen.
Emergency mode works, thought i try to reflash stock rom. Downloaded V10J and V20C (from csmg), flashed with KDZ_FW_UPD. Progress is going ok, phone reboots at the end, and back to the pattern lock screen. Tried with diag, emergency, cs_emergency, no go.
Tried with LG Flash Tool 2014, the same pattern screen.
Then tried LG Mobile Support tool. It connected only in emergency mode. And the software version is STILL V10E !!! After flashing with V10J, V20C, and rootable V20A and V20C kdz from this thread.
Support tool prompted update to V20C, so i go for it. It told me, that need to update to jelly bean first, then to kitkat. Ok, go! Downloaded, finished update, and said to continue update to kitkat. Clicked continue, and it started over, again wrote that firt to jelly bean and then kitkat. Version remained the same V10E.
It seems, if it is some form of "simulate mode" enabled (cd writing softwares has this function), no real process is performed. No errors in any tools, absolute normal progress everywhere.
Any idea how to do factory reset? Or how I get out of this "simulation" mode?
One of KDZ_FW_UPG logs (seems OK, but V10E remains):
Upo_hu said:
Hello! I have a strange problem. Phone is P710 with open eu V10E rom. Kids played with the unlock pattern, and no data connection, phone locked, can not enter past the pattern screen.
No problem, do a factory reset! Power off, button combination, green robot appears. Reboots, and again the pattern screen with the kid smiling on the background picture...
Of course no usb debugging enabled, so we ended in normal mode.
Tried stock recovery (with the lg service picture), but no menu, just the picture. Adb is present with $ prompt, so no root, data not mounted, and cannot mount without root.
Thought i will try fastboot erase data. Tried adb reboot bootloader, but no fastboot, just reboots to the pattern screen. Strangely adb reboot recovery also does'nt boot back to recovery, but to normal pattern lock screen.
Emergency mode works, thought i try to reflash stock rom. Downloaded V10J and V20C (from csmg), flashed with KDZ_FW_UPD. Progress is going ok, phone reboots at the end, and back to the pattern lock screen. Tried with diag, emergency, cs_emergency, no go.
Tried with LG Flash Tool 2014, the same pattern screen.
Then tried LG Mobile Support tool. It connected only in emergency mode. And the software version is STILL V10E !!! After flashing with V10J, V20C, and rootable V20A and V20C kdz from this thread.
Support tool prompted update to V20C, so i go for it. It told me, that need to update to jelly bean first, then to kitkat. Ok, go! Downloaded, finished update, and said to continue update to kitkat. Clicked continue, and it started over, again wrote that firt to jelly bean and then kitkat. Version remained the same V10E.
It seems, if it is some form of "simulate mode" enabled (cd writing softwares has this function), no real process is performed. No errors in any tools, absolute normal progress everywhere.
Any idea how to do factory reset? Or how I get out of this "simulation" mode?
One of KDZ_FW_UPG logs (seems OK, but V10E remains):
Click to expand...
Click to collapse
Hi,
I've the same issue, but instead I've access to phone with many crash from applications.
I tried everything: factory from settings, by keys combination, flash KDZ for upgrade and downgrade (all completed with no errors).
I would flash it by recovery but is phone is stocked and any modification goes away after reboot (seems right a live mode of Android).
I've check by adb and /data partition is mounted rw but I have not root rights to do other things.
Someone has found a solution?

I got my Nexus 9 in a boot loop

So I recently got a Nexus 9. I think it was affected by the battery issues with android nougat. I rooted and used greenify and got much better battery life but decided I wanted to unroot and see if over a couple days the battery life would have gotten better. So I connected to my computer and stupidly sent the "fastboot flashing lock" command and now my Nexus is stuck in a boot loop because of TWRP. I knew that locking the bootloader would initiate a factory reset but didn't take into account that TWRP may affect that so now I can not use my Nexus. The device says it is a developer edition and not intended for personal use and I don't I know what to try. Just letting everyone know I only tried to sideloading and flash. I appreciate everyone who takes the time to read this and try to help.
Have you tried following instructions from google to flash a factory image ?
https://developers.google.com/android/images
I have but I can't flash due to the bootloader being locked and I can't sideloading because every time I tried it just errors or does nothing
AUSTIZ1997 said:
I have but I can't flash due to the bootloader being locked and I can't sideloading because every time I tried it just errors or does nothing
Click to expand...
Click to collapse
Did you try booting your nexus to fast boot and execute fastboot oem unlock?
I have​, it just send me an error message
Update, I was able to finally get into the custom recovery and tried to flash the stock recovery and now it just boots into fastboot mode but I got rid of the custom recovery (as far as I know) and the boot screen that said the tablet was a developer device
Same problem here in May 2017, the OTA update prompted by Google sent the device into a bootloop. As the Bootloader was locked and there was no way to change to USB debugging mode it wasn't possible to use Recovery mode or to flash an OTA. Wiped data cache, tried all options in HBoot menu, tried flashing OTAs and full block OTA didn't work either. Just stuck in bootloop.
Repair shop encountered same problems so they then suspected the logic board. They heated it up to reflow the solder and success! Logic board may fail again through dry joint but I believe this risk can't be avoided by switching manufacturer as they all use the same component-to-board soldering practice.

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