3.2.1
One note, max99 mentioned attached usb cable might cause his/her first update failed. Doesn't make much sense. But when you are in deep @#$!, every last straw counts. So I followed that advice on my second try.
Tried to create a 3.3 update package from my soon to be back K3K, but Update is disabled. I heard there's nothing worth trying there? Or can you use the default Amazon 3.3 firmware on top of 3.2.1 on DXG?