Thanks for the idea but no luck.
I've taken 310 firmware (device has 320). Extracted boot and fw_all, then I've modified them with test.bat and test.xsc (added all replaces) and made GUPDATE.gcd. I've tried to place it in Garmin folder and .System
There is small hope that device doesn't support 16gb sd card. I will try to find a smaller one.
I do not hold turn on button... The device seems to be working because sometime I see loading it maps and I've saw once a message that power cable is disconnected after I disconnected USB during logo.
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