[GUIDE][FIX] Bricklooping Lettuce (YU Yuphoria) , No IMEI , Corrupt EFS

Hello Good People !!!

So yesterday,I encountered a brickloop on my lettuce and after around 10 hours of trying almost all methods,I was finally able to solve it.Though,mainly I was able to try all these as I had already got my replacement request from Amazon approved... :D

For those who don't know,brickloop is a situation when the device bootloops just after the YU logo and this bootloop isn't resolved even after factory image flash or any other ROM flash .

I cannot guarantee that this will work for everyone. However It has proven to be a solution for almost everyone that have used it. So if it does not work I ask that you be respectful in posting as such.

I am making a package for you to download which contains all files needed to make this happen (You need three more files,modemst1.img and modemst2.img and latest CM nightly but I am not going to give you those as I don't want everyone to have my IMEI on their lettuce :p . Though I will definitely tell you how to get those two files.) Download the package here :- https://www.androidfilehost.com/?fid=24052804347796818
So inside it you will have these files:
persist.img
adb 1.0.32

INSTRUCTIONS :-

Please note that any commands run in fastboot mode require you to have an unlocked boot loader. If you are not sure if you are unlocked then that means you aren't! So to unlock the bootloader,follow this guide :- http://forums.yuplaygod.com/threads/...uphoria.13785/

Step 1 :- You need to have proper adb/fastboot drivers installed.If you have unlocked bootloader ever or did so by the above guide,you already have these drivers with you.Else,use this guide to get drivers working :- http://forums.yuplaygod.com/threads/...astboot.15025/ After you have made the drivers to work,continue to the next step.If you have issues in making drivers work,tag me in the thread and I will try my best to help you out.

Step 2 :- Extract the downloaded Zip on the Desktop .

Step 3 :- Open the adb1032 folder extracted on the desktop and put the latest CM nightly,modemst1.img and modemsr2.img inside it.Open Command Window by pressing Shift Key + Right click anywhere inside the folder and then selecting Open Command Window here.Boot your phone to fastboot mode.

Step 4 :- Now type the following command inside the Command Window or just copy-paste it :-

Code:

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fastboot -i 0x2A96 erase persist

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Wait for the process to complete (Should take less than 5 seconds).

Step 5 :- Type the following command inside the Command Window or just copy-paste it :-

Code:

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fastboot -i 0x2A96 flash persist persist.img

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Wait for the process to complete (Should take less than 5 seconds).

Step 6 :- (In most cases,the issue is solved in the Step 5 only.But still I recommend following all these steps.If you,by any chance,don't have modemst1.img and modemst2.img with you,DIRECTLY SKIP TO STEP 7) Type the following commands one by one :-

Code:

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fastboot -i 0x2A96 erase modemst1

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Code:

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fastboot -i 0x2A96 erase modemst2

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Code:

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fastboot -i 0x2A96 flash modemst1 modemst1.img

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Code:

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fastboot -i 0x2A96  flash modemst2 modemst2.img

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Step 7 :- If you don't have TWRP flashed,flash it from this thread :- http://forums.yuplaygod.com/threads/...1-08-15.13974/

Step 8 :- DON'T DO fastboot -i 0x2A96 reboot BUT instead remove the battery and then put it again and boot to recovery by pressing Power+Vol. Down button.

Step 9 :- Inside recovery,in the advanced folder,select ADB Sideload and select "Wipe Dalvik Cache" and "Cache" and swipe to start ADB Sideload.

Step 10 :- In the command window on your pc,type (Replace xxx with the correct Nightly name ;)) :-

Code:

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adb sideload  cm-xx-xxxxxxxx-NIGHTLY-lettuce.zip

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Wait for the nightly to flash.

Step 11 :- From inside the recovery,reboot to system.

Your phone will be back now ....... Yayyyyy !!!!

And yeah,how to get modemst1.img and modemst2.img :-

Step 1 :- Download this app on your phone :- https://play.google.com/store/apps/d...nam.partitions

Step 2 :- Grant root access and in the settings,select storage to external sdcard and backup format to .img .

Step 3 :- Backup all partitions by selecting them and pressing a download like button at the bottom right . (Though we need to backup only modemst1 and modemst2 but I recommend you to backup all ... But yeah,first backup modemst1 and modemst2 and then backup others.The main reason I was able to restore my phone was because I had backup of all partitions,)

Step 4 :- In your external sdcard,find the modemst1.img and modemst2.img and save them inside the specified folder and also at as many secure places as you can so that these files never get lost.)

Please Note :- Most of the times,even a corrupt EFS is solved just by erasing and flashing persist.So don't worry much if you forgot to take its backup.Also,sometimes,a brickloop might be caused due to any other partition getting corrupted and that too can be solved but that is very rare.If this guide doesn't help in solving brickloop,tag me here,and I will help you out.