Sorry i forgot to tell you to remove any GCD file first and check you have Garmin USB Drivers loaded to the computer but i'll edit my post to include now. They're kinda the top points in "Garmin RGN Flashing 1.01" so it's easy to overlook telling users to do that upfront. My apologies for causing you some extra work but full credit to you for working it out anyway.

Keep the original 41.bin safe and also now do another backup and then a further final one if you convert fully. You can use the same SD card as hybrid provided you remove the file named "last_id.bin" from 0827 folder after each use of the card. After you fully convert you'll need to replace the Ldr.bin [boot.bin renamed] with the one from 0934 HWID firmware and have the final folder as "0934" of course.