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What are the security implications of a Android bootloader?
All answers are true
When locked prevents loading custom ROMS, kernels or start-up files on phones
Limits the phone to mostly manufacturer and the carrier approved software.
When unlocked allows cold boot attack to recover the key for Android's full disk encryption
Having an unlocked bootloader enables you to flash custom roms, custom kernels, recoveries and so on. A locked bootloader locks write access to several partitions like the system partition. Rooting a device requires write access to the system partition (for storing the superuser binary and the superuser app). Without an unlocked bootloader, only a temporary half-root can be achieved.
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