[sasaki]

Thank you for your answer. I am aware I can just register the normal way, but I would like to avoid it if possible. I am not afraid of spamming but I definitely don't want kobo to access my readings stats, and It looks like registering the normal way would make me sign their EULA. Bypassing the registration process looks like the minimal protection against it.

I'm quite sure there is an easy way to reset it to default, either by deleting the .kobo folder (but I fear it may brick my device) or by modifying the correct entry in the database.

For instance, could someone synchronizing the data tell me about the content of their fields "LibrarySyncType" and "LibrarySyncTime" in their user table inside the database ?
Maybe Synchronization info is located elsewhere ?

I will probably update the firmware in the end as this sideloaded mode seems very interesting, but I probably should first get rid of this critical error.