Ok I am having difficulty finding information about this on the forums and on the freenode #cyanogenmod chat, nobody seems to know. I have an SGH-i547 Rugby Pro that I succesffully rooted, installed twrp, made the backups and installed Cyanogenmod following the steps in the Rugby Pro super thread by kenomine96. Since then a few circumstances have changed. After modding I had the phone unlocked and switched from ATT to Tmobile. What I want to do now is revert the phone to stock, but my concern is that my TWRP backups were created while I was using ATT. If I used these backups to restore the original operating system would this potentially brick my phone or otherwise render me unable to connect to the Tmobile network? Any tips and advice would be really appreciated guys I do not want to jump into this blind and end up with a screwed up phone.