У вашего броузера проблема в совместимости с HTML5
Follow the links to download twrp and Lineage OS 13. First you need to have an unlocked bootloader, granted by Xiaomi, then
Fastboot flash recovery twrp-3.1.0-markw.img
Fastboot boot twrp-3.1.0-markw.img
In twrp, install lineage os, su addon, and open gapps.
TWRP 3.1.0 Download (guaranteed to work with reboot menu and 8.1.2.0 bootloader - my setup)
http://depositfiles.com/files/gxmf5dlef
LineageOS Download 06.05 - Fixed POWER HAL and a bunch of other stuff
http://depositfiles.com/files/3np6gbh2j
SU addon for arm64, Lineage 13
https://mirrorbits.lineageos.org/su/13.0/addonsu-arm64-signed.zip