what do I need to backup when installing custom rom?

[Ahmed-moh]

I want to instal custom rom.. So I need to know what I have to backup? ( I m not asking about my own data) in case if I want to get back to stock rom 😊

[Thommo]

Depends if you have unlocked your bootloader - You may want to look into backing up the TA partition and looking into creating your own stock .ftf firmware file

[Ahmed-moh]

Thank you for replying
I didn't unlock my bootloader yet
All I have to backup is only stock ftf and TA partition

[Thommo · Accepted solution]

To backup the TA partition you need root 1st so check XDA to see if there is a way on your device and if there is then backup the TA partition, There will be a guide on XDA, Then once you have created your stock firmware file you will then need to unlock your bootloader in preparation for custom ROM installation - No need to worry about DRM keys as your TA backup has them safe

[Ahmed-moh]

How about my IMEI number (efs data.) did i have to backup it

[Thommo]

No and you can't backup an IMEI number