Software updates without Garmin account

Hello,

I'm using Forerunner 255 Music as a completely standalone device, with no Garmin account linked to it. My question is about the software/firmware updates. As far as I know, updates can be done by any of the following methods:

  • Bluetooth, via Garmin Connect app on a smartphone (which requires Garmin account)
  • WiFi, directly over home network (WiFi connection setup only available through Garmin Connect app, which requires Garmin account)
  • USB, via Garmin Express app (which also requires Garmin account)

Is there a way to manually update to the latest firmware, without the need for a Garmin account? Looking forward to your replies.

Best regards.