Just get rid of those Renard boards is my advice because they cause us too many headaches reading the support posts.
I am sorry Gill, but the Renard boards are here to stay, I have over 1,000+ channels setup using them in a centralised controller arrangement with remote AC SSR's so they will not be going anywhere anytime soon. No doubt I will be figuring a suitable workaround for driving them, there are way too many hours of precise sequencing involved over the last 9 years to throw away, let alone the installation that they control.
Re-Flashing to DMX isn't a go-er I am afraid, everything is super-stable running as Renard so no point in changing or disturbing the system.
Cheers,
Terry