First you’ll need to download MIUI 8 Global ROM, you can find it 220.127.116.11 version here.
Make sure you’ve done backup of your personal data, and remember that you’re doing everything at your own risk!
UPD: If case you get “ERROR 7” while installing MIUI 8 Global 18.104.22.168 on Redmi 4A that means that you don’t have enough free space in “CUST” folder.
Remember that you’re doing everything at your own risk!
SuperSU 2.79 – UPDATE-SuperSU-v2.79-20161211114519.zip
MIUI 8 Global ROM 22.214.171.124 – miui_HM4AGlobal_V126.96.36.199.MCCMIDI_406ea332ac_6.0.zip
Latest Official Global Stable ROM for Redmi 4A 188.8.131.52: Download