I think it won't be good, when the phone is with an International CID even if she bought it from T-Mobile with a T-Mobile CID, right? Flashing stock international would be no problem with S-Off (Just change CID and flash a stock international rom).
The main question is, can I change the CID to an international one, flash a stock rom, change CID back to T-Mobile one, make phone S-On and locked, flash stock recovery and update thorugh OTA? Will the phone get the T-Mobile OTA from then on?
Or do you think I should change the CID to an international one, flash stock, make it locked and s-on and give it to t-mobile?
Many questions but I hope I can get even one answer