Good to hear your Mini is back working!
If you use a hex editor, at offset 0x200 in the image file, you will find the serial number. There are other copies of it elsewhere in the image but that seems to be the one that is used when factory resetting a Kobo.
I don't think it is much of an issue since quite a few people out there seem to be happily using an all 0s serial number.
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