PM sent.
As to Kobo preventing this, I'm not sure how. If something goes at exactly the wrong time, there will be nothing that can be done. And Kobo have set this up so that it is very hard to break. After nearly five years of doing this on all my devices, I've only had one failed update and that was definitely my fault.
As to avoiding updates, just don't sync. After setting up the device, that is the ONLY time the firmware version is checked and updated. There are ways to patch the firmware to prevent the update. Doing a search here will find them.
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