Originally Posted by murg
The transition through the 2.0.4/2.1.5 update looks like it permanently changes the Firmware Update Management firmware. Since those versions were installed, a factory reset took me back to 1.9.11, then a Desktop drive update took me to 2.1.5.
I can confirm this. I have done two factory resets today (don't ask) and the Kobo desktop app took me straight from 1.9.11 to 2.1.5.