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Flashing must be enabled in the OS settings. Without that, the bootloader can't be unlocked.

• wanderingmind 2y ago
  Yes sorry forgot that. First thing to do when buying a phone is to enable Developer settings and unlock bootloader I guess
  • wkat4242 2y ago
    You could but then you also leave it wide open for others to mess with it if they get their hands on it (evil maid attack) There's a reason security-conscious roms like GrapheneOS and CalyxOS only support devices where the bootloader can be relocked after installing.
    • jjeaff 2y ago
      there also quite a few apps, like many banking apps that refuse to work on a rooted phone.
      • wkat4242 2y ago
        These roms are not rooted as they consider rooting a security hole (which it is if you don't know what you're doing)