[AlanHK]

I have a reference book in the form of a mobi file, sideloadeed to Kindle. It works fine, but has no thumbnail cover image.

I mostly make AZW by Kindlegen in Sigil, and I set an ASIN name in the OPF. That makes the AZW and a cover image in the format:
thumbnail_ASINGOESHERE_portrait.jpg

With other mobis I coud use kindleuppack to get image and an OPF which lists the ASIN, then make a thumbnail with the correct name.

For this however, Kindleunpack crashes.

So is there any way to find the ASIN used for the file?
e.g., in any of the other readable files on the Kindle?
I did look on Amazon, and it's not for sale, so probably not an official ASIN in any case.


PW3 on 5.10.3 firmware, jailbroken.