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The most common cause is downgrading. In this case it was caused by hard-flashing an old 3.55 FW backup without a backup of the most recently installed/soft-flashed 3.55 FW. Basically, every time you soft flash, some of the contents of the flash change even though it's the same firmware being flashed. Moral of the story... always make backups even if you have a known-working backup
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