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Help SM-J327T1 gets Major update today

Very similar phone, Samsung Galaxy J3 Star, model no. SM-J337
I bought it used, unlocked from T-Mobile, phone/data service from AT&T.

I was brutally slammed by an online update from "T-Mobile" and a number of other "issues" although my service is not with them, and the phone is supposed to be unlocked.
T-Mobile's apps and branding cannot be removed from the phone, and certain features remain permanently crippled.
  • No IPv6 support. The device is apparently limited to IPv4 only, or else it's some other issue with AT&T service. I don't know.
  • No Bluetooth tethering, and no file transfer via Bluetooth; Bluetooth functionality remainss crippled and limited to voice call and streaming media only.
Screenshot_20191204-111945_Settings.jpg Screenshot_20191204-122539_MyIPv6.jpg
 
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