Thanks for the Infos, i now have extracted the primary.bin into dump.hex, dump.dis, dump.strings and dump.elf.
What next? I am a little bit lost and need some help, it is too much new stuff for me

(gdb, qemu ....)
As i can see there is a port starting for the subversion #51 can i use these infos as starting point? and how?
Please can you move this to the development thread.