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[A Former User]

because only a few smartphone possible change system operating? many smartphone have OEM bootloader

[MrT10001]

You have to unlock the bootloader before you can install any custom Android ROM, or alternative OS, such as Ubuntu Touch. Ubuntu Touch will only go on a device that someone has created a port for.

[A Former User]

mi device fairphone 4 android 12 i check and possible change operating system but the problem: the device locked but i have unlocked OEM whi happen?

[Keneda]

@carlos80
Please stick to your installing issue thread : https://forums.ubports.com/topic/9247/install-ubuntu/3

You won't get more or quicker help splitting your question.