ok, figured it out...
it takes some time, but its worth it.
So the issue was: getting a FW unlocked and flashed to a Garmin device which is not in the known lists... while using windows tools on a Mac. (you can also do the following using windows).
-First, find your device type on the device. GarminDevice.xml
-Find out that your device is not listed on the known HWID lists.
-Try to find it somewhere else online
-Either find it here (
[Please Register or Login to download file] ) or follow this guide to download your latest FW onto a USB stick (
[Please Register or Login to download file] )
-Now you have the FW you want to patch, but you can only do this with windows .exe's. Download Virtualbox for Mac and a Win7 image from Microsoft (
[Please Register or Login to download file] )
-Download the patcher from first post of this thread
-Download RGNTool from its authors website (google for RGN_Tool)
-Execute all steps in the tutorial from this thread in the VirtualBox guest (share drives to copy paste all files back and forth)
-Connect the Garmin and select in Virtualbox that you want to share this device as USB device in (install Oracle VM VirtualBox Extension Pack to share usb device)
-Find out that virtual box is too slow to catch up with the short time of the boot loader of the Garmin.
-Find a hotel nearby with public computer, install Garmin drivers, run update.exe
-....
-profit
So, managed to get a firmware patched from a device which was not on the list. But only with the help from a windows computer.
Other tutorial used for reference:
[Please Register or Login to download file]