Is there any way to completely flash or reformat a g5 galaxy, is there no way to remove tmobile from my phone? what I'm trying to do.

You could root it & add your own firmware to it.

Plenty of guides on the net, Not sure if you're allowed to talk about it here.


I just switched from Sprint to Tmobile with my S7, And it was causing issues having the sprint firmware on my phone.. So i just flashed it to tmobile :3

XDA Developers is a good resource for this.

with cyangen mod done I'd wait a bit and see what LineageOS is doing.
Not all of there os's are stable on all phones just yet but they are the cyangen mod team.