Hello,
I bought a Garmin Edge 830 a few days ago but seems that is not working. When I put the ciclo computer in to the extended support the device starts looking for external charger and after some seconds shutdown.
I did an upgrade to firmware to the last version available and a couple of resets to factory settings, but the result is always the same.
short video of the behavior https://www.dropbox.com/s/32md3em322xnru3/Video%2013-03-2021%2C%2013%2021%2015.mov?dl=0
regards
ilidio