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Look in the file .kobo/version. If the last entry is 00000000-0000-0000-0000-000000000310, you have a mark 3 model; if it is 00000000-0000-0000-0000-000000000320, you have a mark 4 model.
I am not sure whether I understand your problem, but I think it is more related to an error in the data base than to the firmware. One way to rebuild the data base is to sign out and in again (I did this never myself however),
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