Samsung firmware downgrades depend on bootloader version numbers

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Flashing an older Samsung firmware over a newer one is sometimes possible, but the bootloader revision decides the outcome. Each build string contains a bootloader binary digit, and a phone will reject any firmware whose binary number is lower than its current one, with Odin reporting an SW REV check failure. Downgrades therefore work within the same bootloader generation, such as moving to an older build with the same binary, but typically fail when crossing a bootloader bump. Downgrading does not reset a tripped Knox counter, remove carrier locks, or necessarily fix bugs baked into the bootloader. The guide advises noting the current binary, comparing it with the target build, and backing up data first, since downgrades usually wipe user data.

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