[Deicide]

I seem to have found the firmware I'd been looking for... It works just fine, though it now says "Thomson" instead of "Mikomi" on startup.
Nonetheless, here's the link:http://rhinoplanet.com/ok1wt/(PDP6512K).v1.552.2.139.rar
In case it doesn't work I can send the firmware to an e-mail. Hope it's useful to someone else as well.