Comment by WorldPeas

If you're not accustomed to it, arm computers have no BIOS/UEFI boot selection and usually require a custom bootloader to load a new OS. I remember many fun hobby projects of old with x86 where I could take an old x86 appliance and put in a clean linux disk to use the hardware however I wanted, nowadays your OS needs to be signed, and because the root is owned, the software can be limited to that what the OEM or OS company desires, much like what MS is trying to do with TPM2 and Win11. Of all the ARM phones I've seen, perhaps 10% support bootloader unlock, and that's only with a certain carrier, the problem is that it's not a unified platform, support has to be implemented per-device, so even if the bootloader is open, the OS may not be up to date (as many have noted with dodgy third party arm boards)