I've just done the sideload firmware upgrade for Kobo Aura 3.3.0, and it seems to be fine.
Summary for anyone who find it useful... (problem: Windows could not recognize the device after firmware upgrade).
1) With the out-of-the-box factory installed 2.8.0 (Aura) firmware, Windows can see the device properly. I've copied that installation to a backup.
2) I've downloaded the 3.3.0 firmware from MobileRead (thank you) and copied it onto the device directly. I unplugged the device, and it took the update. When I plug it back in, Windows (and Calibre) can see the device properly. Yay - this is progress.
3) Finally, I need to bypass the registration, since that step is the kiss of death for Windows recognizing the device. Here's an SQL statement to execute to create a suitable record in the "user" table of the Kobo/KoboReader.sqlite to replace the one that's left by the sideloaded firmware, once upgraded.
INSERT INTO "user" VALUES('aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa','aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa','xxxx@xxxx.xxx','xxxx@xxxx.xxx','a', 'a','FALSE','FALSE','FALSE');
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