here is the step from turboccc
•File->Open and select your US firmware GCD or RGN file
•Click the Save button in the boot.bin section (the first on top) and save it to boot_us.bin
•File->Open and select your Sg/Mal firmware GCD or RGN file
•Click the Load button in the boot.bin section (the first on top) and load boot_us.bin (the one you saved in previous step)
•Notice the HWID and SW Version from this boot.bin and copy those numbers in the Overrides section. Enable the checkboxes and put the numbers from boot.bin.
•File->Save to RGN (or to GCD) and select the RGN (or GCD) file name.
•Flash RGN in pre-boot/service mode using updater.exe from Garmin, or copy GUPDATE.GCD to your GPS and reboot.
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