(Oops, almost missed your edit saying it did not work out. I suggest you post new developments as new replies; otherwise the front page and RSS feeds will not pick up your edit as new.)
Schussel, how unfortunate! The failure mode does not ring a bell; I wonder what the problem is.
Perhaps the apk file was corrupted, or the restore set's is from a different firmware version? My apk (from 1.0.04) has the following md5sum:
$ md5sum framework-res.apk
Perhaps you can still access your Reader remotely via adb? Then you could still follow my instructions for extracting the apk file on the reader itself.