I’ve built the required changes into an SD image so that it’s easier to use until they are merged. The image includes the required serial changes, the modified pySangaboard module version and the Sangaboard software extension for controlling illumination and upgrading firmware.
Here are the full image and lite image. With these images, the boards should work out of the box (tested on a Pi 3, I’ll test it on a Pi 4 soon but it should work the same). Please consider these a temporary fix until the changes are reviewed and merged into the official distribution version and when that happens migrate to an official version to get the best experience.