En el grupo de Telegram de Mi 5 Arsenal han puesto esto
It's not recommended to flash miui 8.4.19 oreo based on mi5 ,there are serious gpu energy leak issues plaguing the firmware and China and global are suspended due to reboot issue and high energy drain from GPU
This affects the whole 820 Xiaomi platform.
Also there's a kernel mixup causing some of the lower binned 820 lite series devices to have camera issues due to increase in headroom voltage