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Oh, I was wrong!
When I did the factory reset, it didn't just wipe my configuration, it actually restored the old original OS version (4.0.7523 in this case). That's weird! It must save a copy of the original firmware version on the sdcard somewhere.
Interestingly, it did not wipe out some custom directories I had on the sdcard. That's not a very good factory reset in that case.
I tried another upgrade just now. I deleted my custom ebook on the device and there was no registration. The device was in first-time setup mode and I installed the upgrade files. The system upgraded and once again I have a black screen.
There's something wrong with this process or the kobo-update-4.18.13737.zip file I downloaded. I did download it twice and compared sha256s and they were the same.
Either some intermediate upgrade is required or the upgrade is broken. The system was as factory-reset as I know how to make it and it still failed the upgrade.
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