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Keychron announces first open-source firmware for gaming mice
(www.digitalfoundry.net)
This is a most excellent place for technology news and articles.
Have you tried OpenLogi? I'm not sure if it supports that model specifically, but it supports a lot.
It does seem to support newer models, G600 and especially G13 are quite old and no longer supported even by newer Logitech software. Thanks for the tip anyways, I collect these for possible future needs.