Got it! Just in time before summer vacation. Will digg into it when i get back.
Kindle PW3 300dpi
Ordered at amazon.de, delivered to Austria.
Serial G090 G105 ...
FW: 5.7.4 (2929620018)
Code:
$ file pw3-20160630.bin
pw3-20160630.bin: x86 boot sector
$ ll pw3*
-rw-r--r-- 1 xxx xxx 3269459968 Jun 30 19:21 pw3-20160630.bin
-rw-r--r-- 1 xxx xxx 1897074153 Jun 30 19:21 pw3-20160630.bak.gz