Ok, I figure it out..it's all about this port splitter and it's correct values (device specific). For this Navigon I had to set input to NMRX 2020 driver and baud 57600, added output to port 5 and than Start. Finally I set GPS and port values in Primo to 5 / 57600 and bingo!
Only problem is that Port splitter won't remember settings after device reset/restart. That could be really annoying..
Below is my simple unlock (SD) version if somebody ever needs it. It includes iGO primo 2.0 as this is the only stable version for this device. I have tested many, but all crashed after the language selection (even Primo 1.1 and 1.2). I also edit the script so the PortSplitter is automatically launched along with iGO Primo. But after device reset or restart, you need to manually launch port splitter - go to Explorer icon (or Total Commander) than go to folder \Storage Card\PortSplitter\ and launch Port.exe. Configure settings as described above, confirm and exit, launch Primo. Until you just power off/on device, settings will be preserved.
Yandex:
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Zippyshare:
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