I try to flash mi pad 3 (unlocked). My steps:
1) installed successfully chinese dev rom
2) fastboot -w
3) fastboot flash recovery twrp.img
4) entered tprw
5) “Wipe” , “Advanced Wipe” , “Data” , “Repair or Change File System” , “Resize File System” , swipe to the right to confirm.
6) "mount"...