is it possible to flash a Galaxy S7 G930A with a non AT&T firmware?

[Android Central Question]

I'm having troubles with this AT&T unlocked phone on Ting. old galaxy s4 worked fine. Several different phones of this version worked. With the S7, there are blackouts where nobody can call the phone for 20 minutes at a time. Replaces with new phone. Same problem. Ting says sometimes carrier firmware can mess with settings and cause issues. I was hoping to use Odin to flash with a non AT&T ROM, but it seems this is an AT&T only model. Any hope?

 

[B. Diddy]

I moved this to the S7 Rooting/ROMs forum for more specific traffic.