The challenge seems to be that with the newer Kobos they've removed the ability to do a setup without WiFi. This in turn means that when you initially turn the device on it
a) won't connect via USB to your desktop
b) you'll get a forced upgrade to the current f/w version
Now in theory what should work is to accept that, go through the setup, turn WiFi off , then connect via USB and download and manually copy a compatible f/w build to the .kobo directory and then let the device reboot.
This should install your chosen f/w. For bonus points see if there is a disable upgrade patch available for that particular f/w and install that.
I've not tried this and frankly, have no interest in trying it.
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