Edge 830 does not work with Garmin Express or Garmin Connect.

Garmin express - when connected to pc/mac, detects garmin device, garmin express also detects new device. After pressing "add device" it finds edge 830, but says it can't connect to server (win11), error occurred (mac). I have tried different versions of GE, cables, all recommendations on garmin web. Nothing works.
Garmin connect - similar to GE, it establishes a bluetooth connection, but while adding a device it pops up that there was an error and cannot connect. I have tried both on ios and android, different versions.

I have tried the following firmwares, 3.20, 4.10, 5.0, 5.5, 6.2, 7.1, 9.1, 9.75, 9.79. For all no change as on mac/win, ios/andoroid.

The only thing I can still think of is to format the device to fat32, has anyone tried this? Or could you give me some advice?

Thank you for reply.