Thanks for the tip, I wasn't looking there... on the other hand Ermine now has the Power Savings setting that i was looking for

Yes, finally success! I knew things were going to be different because this time when it finished, it didn't just reboot after a while, but the ereader side had an update message/logo, and after the reboot, after a short display of the usual startup, it actually showed a lengthy "updating software" screen on the LCD panel.

So it's many days ahead of exploring the many distracting facets of the FrankensteinReader (as opposed to the single-purpose devices I mostly used until now)