OEM can only have a backup when you have one of sony's kernels delivered in .IMG flashed into OEM....so if you're on stock...OEM backup isn't necessary because you can't override stock kernel
---------- Post added at 08:12 PM ---------- Previous post was at 08:07 PM ----------
Originally Posted by Deympako
How to install this? Do i need a pc? I just don't know sorry.
Yes..you need a PC
Place the recovery into the same folder that you have minimal adb and fastboot installed (there are thousands of tutorials I you haven't yet)
Rename it to something simple you can remember and type in this after double clicking a file called "Cmd-here.exe"
Adb reboot bootloader (turn on adb debugging and make sure bootloader is unlocked)
Fastboot flash recovery <Your simple file name here>.IMG
Updates can be installed trough twrp itself because sony handles stuff like that differently
Just download reboot to recovery
Install> install IMG> (search for update and tap on it)> tap recovery>swipe