

I’m also struggling to get Earthworm Jim from GOG working on my Steam Deck through heroic, so I’m following your journey with attention.
What’s really annoying in my case is that it worked without installing anything except Heroic at the beginning and now it doesn’t anymore and I don’t know what change is responsibles for the situation…
On my wifés 2012 MacBook Pro, I had the same broadcom related problem and installing Rpm fusion solved it https://ostechnix.com/how-to-enable-rpm-fusion-repository-in-fedora-rhel/