I programmed this firmware long time ago in (~2015/16) via Chilipeppr Program Board Firmware, which points to http://synthetos.github.io/binaries/tinyg-edge-442.04.hex experimental. There is also 440.20 master available, but as I experimented with G2 a lot (gave up after autoleveling failures and many broken bits), I wanted experimental with G2 flavour.
I must say that I did not face any issues with this firmware, except Y axis going opposite direction reported here. It happened in the past and I remember that @jlauer already mentioned it is a kind of old issue.
As I know the workaround now (G0 Y0 or G0 Y-1 or RESET (thx John)) it is easier to keep it under control. Nevertheless that would be nice to have it sorted out in future release.
I still want to put my eye onto G2 again, but don’t have in circuit debugger to move any forward.