Hi, I'm from Mexico and I want to unblock my Samsung A12 (sm-a125m), but when I access to the recovery mode, there is no the option "wipe data/factory reset". I read it can be done installing a newest firmware, but there are three options:
  • Mexico (IUS)
  • Mexico (Movistar) (TMM)
  • Mexico (Telcel) (TCE)

I'm not sure what IUS, TMM and TCE mean, but my phone is not from Telcel o Movistar company, it's from Unefon, so I thought I have to get the first (IUS). is that correct? what does that mean? where can I get information?

ps: sorry for my bad English