Upgrade Android on unlocked AT&T Branded Phone with foreign Service Provider
I purchase an unlocked AT&T Branded Phone (Axon M) a while back through an Amazon FBA seller for use in Canada as a backup.
It is passed the return period.
I set up the phone working fine except Android version is 7.1.2
AT&T Software Update says it is up to date!
I read there is no way to update Android without an active AT&T Sim Card
That's fine but before spending money to get an AT&T Sim Card I would like confirm two things:
1) Will an active prepaid AT&T Sim Card will work or does it have to be a postpaid AT&T Sim card?
2) Can I activate the AT&T Sim Card in Canada and upgrade through Wifi or do I physically have to get across the border say Buffalo to activate there and push the update to the phone while in the U.S.
If I have to go to the U.S. then I've purchased an expensive brick and learned a valuable lesson to never purchase an AT&T branded phone product again.
Thank you in advance for your response.