The SN entry that starts at offset 200 (the first one) is probably all you need to change as it is likely the rest will be rewritten, but a find & replace is not that hard to do. There is no way of knowing what Kobo may decide to do with the firmware, in the future.
Disk Internals Linux Reader can work, but I also have Ext2Fsd running with my SD reader set in the "Ext2 Volume Manager" set to allow read write. Getting it to work can be a little tricky.
Luck;
Ken
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