I will be debranding and flashing an ATT Lumia 640 and flash it to T-Mobile ROM. I have the unlock code for it -- does it make any difference if I do it before or after?
I know that I need to take the ATT SIM out before I debrand & flash. Should I put the T-mobile SIM in, unlock and then debrand with the SIM in, or should I debrand without any SIM, put the SIM in after flashing and unlock.
I know that I need to take the ATT SIM out before I debrand & flash. Should I put the T-mobile SIM in, unlock and then debrand with the SIM in, or should I debrand without any SIM, put the SIM in after flashing and unlock.
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