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Reviving a Locked Canon imageFORMULA ScanFront 400: Booting the Factory-Reset Partition via GRUB

My ScanFront 400 (firmware 2.0.1610.0601) worked fine but was locked by an unknown Administrator password. The rear reset button didn’t work, and forcing GRUB to show at boot also failed initially. I attached a USB keyboard & mouse, booted a lightweight live Linux from USB, and edited GRUB (Legacy) on the scanner’s internal MMC so …

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