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If the EVT_EXIT event is not received, then the settings won't be saved either on shutdown. Do you see the application starting up with the correct or wrong page number when you power the device back up?
If you automatically start the next archive, can you see if the old application might still be running? Perhaps it never gets the EVT_EXIT event until the device is powering down, and it overwrites the cover from the later application?
I'm a little suspicious of the device behaviour with the latest firmware. On my Inkpad 1, the internal SD card was destroyed by the new firmware, and I started seeing problems with the cover image because it was not being saved to the filesystem. Eventually, not even the files I copied over or deleted survived power cycles. So, please check that everything else with the internal filesystem is working correctly.
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