I seem to have lost the ability to unlock the bootloader of my XT1700. I previously had unlocked the bootloader and installed TWRP and SuperSU, which took a while to figure out, but it worked. Today I tried to install a newer version of the stock firmware using SP flash tool (from here), which seemed to work fine, except now I find I am unable to reinstalled TWRP or SuperSU because I cannot unlock the boot loader.
When the phone boots, I still see the "device unlocked" message, and I have enabled oem unlocking and USB debugging in the developer options menu, however when I go into fastboot mode, if I run the "fastboot oem unlock" command, when the phone prompts me to press up or down, I get an "unlocking failed" error, and Fastboot reports "Unlock operation is not allowed"
Any ideas on how I can unlock this device again?
So it seems like those firmware images must have locked boot loaders. I ended up installing an xt1706 firmware instead (from here) and was able to unlock the boot loader successfully.
Anyone know where to get xt1700 stock firmwares with unlocked boot loader?
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My Moto G4 Plus (XT1643) is perfectly functional.
I decided to unlock the bootloader, and it worked (fastboot screen seconds that too).
However, before unlocking the bootloader, i accidentally flashed TWRP through ADB, and it failed after some steps.
Now, even after the bootloader has been unlocked, I pretty much cannot flash anything.
I get the "Bootloader validation failed", and "remote error".
And whenever I try to flash any recovery, it says "error : 'filename' cannot be loaded".
Any help is appreciated,
thanks.
It could be that you have disabled the option (OEM UNLOCK) in developer options! Check it, it has to be checked to flash through fastboot
what i messed up?
i have installed custom official cynogen14.1 rom and twrp recovery. everything was working fine.
but i messed up with bootloader. I have locked oem from fastboot mode without enabling option for oem unlocking in developer settings.
Now as my phone have custom rom and twrp installed it went into bootloop and only shows zuk logo and again restart.
What i diid till now?
i have opened backcover so that i can turn of bootloop and phone by disconecting battery.
I can enter into fastboot mode by pressing vol.+ and vol- buttons sumultaneously and connecting usb cable.
But i cannot unlock bootloader as it says unlocking bootloader not allowed. I have tried device specific commads like "fastboot -i 0x2b4c oem unlock" and "fastboot -i 0x2b4c oem unlock-go" but nothing works.
i have stock recovery image but cannot flash while bootloader is locked.
i can enter into adb sideload by following method:
by loading stock recovery by typing "fastboot boot recovery.img" (this does not work with twrp as it says signature varification failed)
and then selecting apply update >> selecting apply fron adb
this much i can do does anyone knows how to recover from such a state.
please help me or my phone will be a waste.
is there any way to install stock recovery i think phone will boot properly if i managed to install stock recovery.
Hi,
I've tried all the following steps in the video and I got the error "flashing lock is not allowed". I've already flashed stock rom and recovery and wiped the phone so it's as stock as it gets yet I still get the same error when I enter "fastboot oem lock". Please help ASAP!!!! I'm trying to update to Android 8.0 but the update keeps failing because my bootloader is unlocked
Thanks in advanced.
https://forum.xda-developers.com/oneplus-5/how-to/lock-oneplus-5-bootloader-guide-t3651819
Go to developer settings.. check the oem unlock option. If it's off, bootloader won't relock. You need to turn it on. If it's greyed out & can't be turned on, then you need to root your firmware or flash custom rom & turn it on.
When you have this problem, only magisk will help you turn on allow bootloader unlocked when it's grayed out.
So, you have to flash magisk, turn on allow bootloader to be unlocked in devlopper settings, then flash a clean OOS, make sure there's no modification like custom recovery or root, then relock your bootloader.
Good luck!
use command "fastboot flashing lock" instead of "fastboot oem lock", this will lock your bootloader
hope this tutorial will help you....!!! https://www.youtube.com/watch?v=CQYCSdDUdAU
I had the same problem and solved using magistik, reenable unlock volta loader and After relock.
Hello all! I have been trying to unlock my bootloader on my SGP311. I have searched the threads, followed the instructions, and still have problems. i initially looked at my service menu to determine if it is unlockable and it said yes. I then went through the steps to unlock it and it kept saying failed. Then, it finally worked, and my tablet rebooted. i got dual recovery loaded and then proceeded to wipe and install lineageOS from recovery. recovery kept failing to install the new rom. i then had to reflash a stock rom because the tablet wouldnt even boot into recovery again. now my service menu simply says rooting status: unknown and says nothing about the bootloader. What the heck happened?
Gilly86 said:
Hello all! I have been trying to unlock my bootloader on my SGP311. I have searched the threads, followed the instructions, and still have problems. i initially looked at my service menu to determine if it is unlockable and it said yes. I then went through the steps to unlock it and it kept saying failed. Then, it finally worked, and my tablet rebooted. i got dual recovery loaded and then proceeded to wipe and install lineageOS from recovery. recovery kept failing to install the new rom. i then had to reflash a stock rom because the tablet wouldnt even boot into recovery again. now my service menu simply says rooting status: unknown and says nothing about the bootloader. What the heck happened?
Click to expand...
Click to collapse
You can't install LOS Rom from the dual recovery (XZDR). By flashing stock ROM, you bootloader may be locked again.
Check this guide to unlock it, and install LOS.
It simply will not let me unlock the bootloader anymore. And I can't seem to find a firmware that I can flash to get me to the appropriate version
so far, part of the problem is flashtool in androxyde still using the command fastboot -i 0x0fce oem unlock 0xkey. windows 10 denies this command every time and should be fastboot oem unlock 0xkey. But even doing so manually through the cmd prompt, it still will not let me unlock the bootloader. does anyone have a ftf file that has an unlockable bootloader? seems mine locked up completely when i reflashed the rom
Gilly86 said:
so far, part of the problem is flashtool in androxyde still using the command fastboot -i 0x0fce oem unlock 0xkey. windows 10 denies this command every time and should be fastboot oem unlock 0xkey. But even doing so manually through the cmd prompt, it still will not let me unlock the bootloader. does anyone have a ftf file that has an unlockable bootloader? seems mine locked up completely when i reflashed the rom
Click to expand...
Click to collapse
bootloader is in device, not in firmware, so no such firmware exist you ask for.
Hello. I have a lg v20 H990N. I flashed TWRP by dirty santa method and wanted to go back to stock. As per the instructions on the link https://forum.xda-developers.com/v20...-h990-t3624296, I used method 1a for going back to stock. I ran the code as mentioned in the method while using my backed up "abootbackup.img" but I accidently ran the code twice.
Code:
dd if=abootbackup.img of=/dev/block/bootdevice/by-name/aboot
sync
sleep 30
sync
After booting to bootloader. this is what I see written on the boot loader screen.
___________________________________
Welcome to fastboot mode for bootloader unlock:
*Quick Guidnance
1) Read Device Id
fastboot oem device-id
2) Write unlock key
fastboot flash unlock unlock.bin
3) Check boiotloader is unlocked
Fastboot getvar unlocked
*How to exit fastboot mide
USe "Fastboot reboot' command if fastboot is available
________________________________________
This is the meassage that pops up in fastboot. I can use fastboot but can't use "fastboot flash recovery twrp-3.0.2-1-h990.img" as it exits with error that remote: device is locked. I can't flash kdz with lg Up as Lg up says " there is no haadset connected". TWRP recovery is also not boot neither is the nougat rom that was installed. More \over my device is shown as "Kedacom USB device " in device manager in fastboot mode. Not in Com ports.
It apperas that my bootloader has locked somehow after flashing abootbackup and I can't unlock it as h990N is not supported by LG to unlock bootloader. screenshot attached.
Please help!!!
Yeah flashing the stock bootloader relocks most v20 variants, (the dirty santa bootloader can't truely unlock them, it just ignores the lock)
I'm not sure what you expected? Your link is broken, but it sounds like you reflashed stock firmware and then the stock bootloader and expected to be in a different situation than a fresh unrooted device?
You should be able to boot normally to Android or boot I to download mode and reroot from scratch.
.