[Xiaomi Redmi 2 Questions & Answers] shanx_verma:
How to go back to stock, fully unrooted.

DISCLAIMER - PLEASE CHOOSE TO FOLLOW THIS GUIDE ONLY AT >YOUR OWN< DISCRETION AND DECISION. DON'T PLAY ANY BLAME GAMES LATER - I'M NOT INTERESTED :p

First Download the suitable FASTBOOT ROM and RECOVERY ROM (both) to your PC from here - (Check first whether you have just Redmi 2 or the Redmi 2 "Prime"/"Pro" version) -

http://en.miui.com/download-261.html (Stable - 7.1.3.0; developer 6.4.14)

Or just for Redmi 2 (MIUI 7 beta 6.5.12) (Redmi 2 Prime updates suspended)

Recovery

http://bigota.d.miui.com/6.5.12/miui_HM2XWCGlobal_6.5.12_238e7fded3_4.4.zip

Fastboot

http://bigota.d.miui.com/6.5.12/wt8...12_20160419.0000.19_4.4_global_19ebfb4951.tgz

0. Make sure you have a BACKUP of your current ROM ready in the external SD CARD (which has to remain inserted throughout this process).

1. Make as much a backup of your internal memory as possible. (Making it in ext. SD card is the best, fastest option, if you have that much space free in external sd card)

2. Reboot to TWRP (if you've installed, which I am guessing to be true).

3. Go into "Wipe", then slide the slider down below all the way to the right. [COLOR]

(THIS WILL ALSO ERASE YOUR INTERNAL SD CARD, SO I AM ASSUMING YOU BACKED UP YOUR DATA FIRST) [/COLOR]

.

4. Now come back to TWRP main menu -> "Mount".

5. Make Sure the MTP status button there shows "Disable MTP", which will mean that MTP is RIGHT NOW in an "Enabled" state. If it shows "Enable MTP", click on it until it shows "Disable MTP".

6. Now connect your Phone to your PC via USB cable, and transfer the recovery ROM which you downloaded earlier, to your external SD Card's main (ROOT) folder, don't make any sub folder. Also make sure that you don't modify the name of the file (as no spaces should be there). Else, just name it update.zip (only if you really want to XD).

7. Now, inside TWRP, go into "Wipe" -> "Advanced Wipe" -> tick "System", "Data", "Cache", "Dalvik Cache", "Internal Memory".

8. Once finished, come back to TWRP main menu.

9. Go to "Install" -> "Select Storage" -> "External SD Card" -> <selectYOURzipFILEnow>.zip

10. Let it install. It might give you error. If so, don't panic. After error, return to main menu. Remove you battery, re-insert it, then press VolumeUP+VolumeDOWN+Power. As soon as MI Logo comes back up, release the buttons. This will let you back to TWRP.

11. In case of error, keep repeating steps 7 to 9. Also, don't forget to post here, WHAT EXACTLY the error screen says.

12. When ROM finally gets installed, congrats! :)

If MIUI really doesn't get installed upto 3-4 tries, don't worry. Remove the battery, let the phone cool down (leave it as it is for minimum 20-30 minutes with battery taken out). After that, try again, just once more.

If, however, you're still unable to install MIUI successfully, then also don't worry, jut follow the steps 7 to 9 again, then take out your battery.

Now while your phone is cooling down, take the time to read this : http://en.miui.com/thread-126437-1-1.html and follow the steps as outlined (don't take any ROM files from there, they are older versions). Just follow there from Step 1 to 9, and you will be back.

Congratulations. Don't forget to NOT root if you want to remain "unrooted" . :P

JUST REMEMBER - DO NOT PANIC, NO MATTER WHAT. YOUR DEVICE IS NOT DEAD UNTIL ANY HARDWARE PART HAS RECEIVED SOME IRREPARABLE DAMAGE IN BETWEEN THIS PROCESS.