I don’t think this issue is caused by colour variants; I have all 3 colours here and all work OK. I’ve just pushed a new release of the latest Inkyshot code to a brand new app (meaning no caching), and everything worked fine. I can only hazard a guess that perhaps there’s some hardware revision that doesn’t work with the old version of the inky Python module?
In that case, the only thing I can suggest to @Richard238 is to bump the versions of all the packages used and go from there. I have prepared a test branch on GitHub that has the latest version of the inky library and associated dependencies here: https://github.com/balenalabs/inkyshot/tree/bump-package-versions
I’ve tested this with my displays here and it works OK. Note to deploy this you’ll have to download it and use the balena CLI to push it as the Deploy with balena button will only push the latest version of the main branch.