How to hard reset Xiaomi Redmi 3s Prime and entering Xiaomi Recovery mode. This video also will show you how to enter Recovery Mode, Fastboot Mode and Download mode.
Read more at:
If you can not enter Recovery mode, it means your current MIUI does not support, you must update the MIUI. Watch this video HOW TO UPDATE XIAOMI MIUI
Make sure to backup your data before perform a hard reset, It will erase all your data and can not be recovered.