I found the RGN_tool. It provided following information.

HWID 1101
SW Version 250

boot.bin

Section 0800 HWID 1101
Size 672508 SW Version 360

fw_all.bin
Section BD02 HWID 1101
Size 12876800 SW Version 360

fw1_resources.bin
Section 7F05 HWID N/A
Size 36979796 SW Version N/A

The other options are greyed out.

Now what I have to do? I took a backup of the garmin device. Unfortunately it was not possible to copy ".System" to same Folder under XP so I named it "_System". I hope the ".System" folder is still active after a crash on the device. Any advice how to backup?