Help help 3G, 4G issues after update

Nn205

New member
Jul 2, 2018
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I'm sorry, I'm so bad English
My Nokia 6 T-1054, it has lost 3G, 4G after update 1 month ago.
The seller does not support me because in Viet Nam, the Chinese phone.
I have bootloader but not root, I have to shut down some underground running of the system, but then turn back still not be.
Hope everybody help please. Thank for all.