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Why don't cell phones have BIOS?
(lemmy.eco.br)
This is a most excellent place for technology news and articles.
Think of installing a custom ROM on a phone like installing a custom BIOS ROM on PC, both are actually not damaging to the device if they fail but require specialized equipment to recover.
Also, some phones and motherboards support special low level recovery modes when a rom fails to boot, but it's usually not easy or documented.