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Updating firmware without Garmin Express; WebUpdater not working

My Edge 530 is currently on version 5.00. For privacy reasons, I don’t want to use Garmin Express to update it (in particular, indoor sessions record my GPS location, potentially opening up a can of privacy worms - remember, data can’t be leaked if it isn’t uploaded to start). The WebUpdater claims that I’m on the latest firmware, which is obviously wrong.

How can I either download and install the 8.20 firmware manually, or fix WebUpdater to do the job? (The issue arises on both Windows 10 and macOS.) There’s a bug in 5.0 that’s impacting some of my workouts, and there are fixes in later releases that seem relevant.

Many thanks for any suggestions.