Goto google n type REDMI 4 ROM DOWNLOAD|
click the first link ...
Goto the rom section by scrolling down and
Download the file of about 1.2 GB.
Copy the file to your phone from your computer.
Goto settings and then system Updater.
Tap on 3 dots on top right and choose CHOOSE PACKAGE option.
Browse the folder containing the downloaded files.
Now update .
Note- this will erase all your current data
So please backup your data prior to considering the update
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