N920A after flash to marshmallow, cannot make/receive phone calls any more

A

AC Question

I used to have a note 5 with T-mobile but my motherboard become bad and needed to be replaced.. Without warranty, I had to go to a off market cell phone repair shop and they could replaced the motherboard. They used a unlock AT&T board running lollipop 5.1.1. I am used to Marshmallow so I managed to manually update to Marshmallow 6.0.1 with security patch level 6/1/16. Now the problem comes.. Everything works fine (wifi, LTE but I cannot make or receive phone call ( I am using T-mobile sim card).. I tried manually set up APN according to T-mobile website's instruction, but still, I cannot make/receive phone call..

Anyone has suggestion to fix the problem? I really do not want to flash it back to lollipop..

Please help!
 

Golfdriver97

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Dec 4, 2012
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I'm wondering if there is a conflict between the board and the carrier. As in you got the ATT ROM, and it's not quite working with the TMo update.

Have you asked TMo what they can do?
 

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