New Mi 6 7.7.14 Unable To Use 3g And 2g

[jeffreyz]

It's seems to can't use 3g and 2g for several versions,also can't make phone call and send messages.

Here i found some information about this 3g and 2g:2g(CDMA UL 825-840MHz DL 870-885MHz) 3g(CDMA2000 UL 1920-1935Mhz DL 2110-2125MHz)