1, used the garmin_kgen_1.5 input the Mapid/device id to create a 25 length code, it works.
2,following in step should have one UnlockMap application, input the unlock code, which create two new unlocked .img files, copy them to the garmin device.

right now i just confused how to unlock the img files if no UnlockMap_v750_ENG.exe available?