Why did you even enter demo mode on that firmware build when it can't be jailbreak-ed?
And just to be sure : did you or didn't your actually try doing a factory reset by creating "DO_FACTORY_RESTORE" file like you were advised on the other forum thread?
So, not doing it from Kindle UI (were you can't because "Reset" option is disabled) but the way you were told to try and do?
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