did you send a message to xiaomi to unlock your device? they will answer after a couple of days that your device is now unlocked. then you can use mi unlocking tool. Then you also have to be logged in into your mi account and verify your phone there or you get stuck at 50%.
no thats not normal. I deleted everything also partitions when changing from chinarom to 6.12.29. but others don't and it works, so I think you have a hardware problem.
Don't they have the same displays? I think they just disabled some things instead of building an extra display. maybe we also got 4gb ram with 1gb disabled^^