Thanks David!
The ereader was on 2.1.5 and installed the 2.2.0 without any complaints until it restarted and froze. After that I tried the 20 sec button reset and all sorts of key combo's, but to no avail.
I mounted the card under Linux and copied all data from the KOBOreader partition and also saved the Mac address. After a final backup image I placed your image on the SDCard and mounted it under Linux so I could copy my original data on that image. The combined image runs fine, has all the books and even recalls what book I was reading.
It is now on 2.0.3 so I can update it again to 2.1.5, now with the Glo version
