Is there a way to download 15.50 firmware? Edge will not go into USB mode. I can update using microsd
I don't think the devices can use secondary memory for firmware updates.
I used the microsd to downgrade to the beta firmware
Using the MicroSD card will not work as it looks in the \Garmin folder of your device's internal storage drive for this file GUPDATE.gcd.
See my earlier message. It works