[Q] How to unlock the bootloader ? - Optimus L3, L5, L7 Q&A, Help & Troubleshooting

I tried using the zip L7CWM.zip file I got here. Rebooted, then I only got secure booting error. Help please ?

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[Q] rom Flashing faild

Hey,
i tryed to flash my vodafone DE brand Trophy with the instruction of ansar,
after 9% it stops "Flash write error happend, please check your PDA Phone"
and on the right side there is a kind of a error message "IU534",
Now my trophy doesn`t boot anymore. Just the bootloader.
What shall i do now?
have you tried redownloading the image and tryed flashing again,,,,,,,dont know if it would work,maybe a corrupt download ?
new to these myself but my flash went ok,,,not same image
i think the download is ok otherwise i couldn have unpacked the .zip file

Help Please! Image signature verify fail

To install to clockwork recovery manually I replaced the recovery.img file but when i restarted my phone it says:
Image signature verify fail
Your boot/recovery image may have an incorrect signature.
Please update your image to a signature official one
you can remove battery for power down.
muz786 said:
To install to clockwork recovery manually I replaced the recovery.img file but when i restarted my phone it says:
Image signature verify fail
Your boot/recovery image may have an incorrect signature.
Please update your image to a signature official one
you can remove battery for power down.
Click to expand...
Click to collapse
You probably are not rooted. Did you root via superoneclick?
Hmmm. Go into recovery and install a custom rom then flash
Make sure you do not have a stock rom on your phone.
If you flashed B528 (I think) Official ROM, you might have locked bootloader... not sure...
You can flash an unlocked bootloader, it's in the android development forum. I'm not sure if this is the fix though.
http://forum.xda-developers.com/showthread.php?t=1457490
OP, have you got u8800+?
Sent from my U8800
Same here
I have ideos x5 pro and i replaced the img file to this and i have the same prob.
I cant even recovery bot my phone. Always tha same message. Plz help
Please help .. any update for this issue
Kindly help me as i m facing the same problem in my phone ( huawei g510 )
the same message still appearing and i can NOT log into recovery menu or anything else
only tow thing to see
Pink screen instead of the recovery menu
or " Image signature verify fail "
PLZZZZZZZZ HELP
:crying::crying:
Flash rom.
Put the official rom in sd card and use the button combo on your device to flash.
I do not have u8800+, i only have u8860, they are quite similar and i believe this would work

lenovo k4 note error in boot.img

hey
i tried unlocking the bootloader using recovery unlocking methods and through sp flash tool, rooting the android version 5.1 thorugh kingroot, then after installing the twrp.img it reboots and throw up an error showing as invalid .img file and install a lenovo.img itself and further it keeps restarting i tried the same with many twrp(recovery.img) files available in many links found in youtube and also in few threads of xda, but nothing working rather than landing up in the same boot error.
pl somebody help me out in the link with working custom boot loader .img and also with steps rather than facing the landing up in the same error.
Same problm
I will try to install recovery with flashify and my devices can't turn on
It will shows invalid boot.img
Help me.....
Sorry for my bad English

Error in Recover Samsung Galaxy J500F

My mobile is working fine until i reboot once. I got frp error on booting time. Then i got it is boot error. So, i search on somewhere and install BL file in mobile by odin. Now i'm getting the following in my boot logs the problem is same but here is not error showing (stuck at samsung galaxy j5 logo). So, i recovery logs at check boot menu.
E :failed to mount /system (Invalid arguments)
I have also tried to update through adb but it is disable in my mobile.
I have also tried to update through external storage but it is disable in my mobile.
I have also used https://forum.xda-developers.com/galaxy-j5/development/recovery-samsung-galaxy-j500f-t3416960 and getting error blocked by frp lock.
did you try to flash firmware with odin?
kanish23 said:
My mobile is working fine until i reboot once. I got frp error on booting time. Then i got it is boot error. So, i search on somewhere and install BL file in mobile by odin. Now i'm getting the following in my boot logs the problem is same but here is not error showing (stuck at samsung galaxy j5 logo). So, i recovery logs at check boot menu.
E :failed to mount /system (Invalid arguments)
I have also tried to update through adb but it is disable in my mobile.
I have also tried to update through external storage but it is disable in my mobile.
I have also used https://forum.xda-developers.com/galaxy-j5/development/recovery-samsung-galaxy-j500f-t3416960 and getting error blocked by frp lock.
Click to expand...
Click to collapse
After flashing stock with Odin, enter in Settings, Developers Settings and activate OEM unlock and debugging, this will prevent the FRP lock, then you can repeat process to flash TWRP and root phone if you want and so...you will be fine.
Thanks for your time actually at that time firmware unavilable from official site so i was trying to make it from unofficial website but now problem is resolved. Again thankyou for support.

Plz help me... can i don't lose my data?

Hello guys, My phone has fatal error. Plz help me T^T
I can't lost my data.
that is very important...
I explain to my Phone's situation.
First. OEM is locked and encryption unsuccessful.
I can use TWRP
but, I can't setup TWRP to my Phone...
Because, I can see the text 'Custom Binary(Recovery) blocked by FRP Lock' when on install TWRP on my phone...
Can i restore my data?...
plz Help me...
waiting solution...
No. Without the oew activated, you will not be able to unlock the bootloader and without the bootloader unlocked you will not be able to install twrp. So the only solution is to reinstall the stock rom via odin.

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