Due to xiaomi phones having bloatwares in their roms especially china roms, there is some sort a need to flash a custom rom in your phone.
This video helps you to unlock your bootloader, install twrp on your phone and flash a custom rom
Note that this voids your warranty and I am not responsible for any problems you cause to your device.
ADB Setup: www.mediafire....
Xiaomi MIUI EU website: xiaomi.eu/comm...
Mi Unlocking tool: en.miui.com/unl...
TWRP for the Xiaomi Mi 9: forum.xda-deve...