I have bought second hand G80 , I found that there is no golf course data in this device.
I have tried express update, update success, but still no data
How can I reinstall the couse data
I would check these steps out. if you already did all these, maybe contact Garmin Support
I read the descriptions in the manual, and while it is a bit ambiguous I am hoping firmware and course updates are available via bluetooth. I don't see any option in the golf app to check versions or upgrade, but maybe those options are not shown unless an upgrade is available.