Hello guys! how are you today , do you want to update your redmi 4a phone to miui 9 with android 7.1.2 nougat? if yes, then read this post and follow this instruction and do your device up to date to miui 9 and android 7.1.2 nougat.
Before install :
* Your all data will erased , make backup before install update.
* You should have connect internet connection during update.
* Battery should 80% and above.
First you need to download official Redmi 4a Developer rom ( miui 9 , android 7.1.2 nougat) may be 1.3 GB . click to given link and download the rom for redmi 4a :