God bless you!I had made that way but it didnt worked for me and I tried to upload the jnx maps on basecamp and format the SD.And then upload the jnx files to the sd with basecamp but it uploads only demo!So now I'm trying to copy the jnx files to sd/garmin/birdseye.
Note: the firmware update worked after formatting the SD. Also the jnx files found from previus user and version cause I bought it second hand!