Built in format has no effect. The original firmware can not be flashed because it has already been flashed. The installer checks if versions match, then exits.
What's strange that after any reboot everything has been reset to a certain date. Books, all settings, pages etc. Deleted Books magically reappear.
Could that have something to do with Titanium Backup which I tried for a short time? I remember the app telling me that superuser had wrong access rights, and offered an automatic fix. I let it do that.
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