If you now have a bricked Glo, return it as a warranty return.
Don't mention the firmware upgrade. Just say it isn't working. This is not to mislead the seller, but will avoid them not understanding what the cause of the problem is (your average book store staff won't know about firmware).
And the device is clearly defective, if it will allow the loading of firmware for a different device to break it completely, with no option of doing a factory reset. Especially as Kobo prior advice on this is that the different firmware versions would be 'incompatible', not that it would render your device completely inoperatable.
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