Mi4c Not Work On 3g Network

[BorisV]

Hi all, I have Mi4c and my phone is not work on any 3G/4G network. I try one sim or two sim, the results is same. Only 2G. Can anyone help me?
Please see this video, I upload his :

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[BorisV]

Any help? Soluition?

 

[246ndh]

Any help? Soluition?

Press *#*#4636#*#*
Then option SIM, select LTE/WCDMA auto or GSM/CDMA auto.

Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk

 

[BorisV]

I try this, and not network. You can see this step in video. Can anyone help me?