Firmware for Siberia 800 Headset

Hi folks, after a couple of years not using it, I tried to set up my old Siberia 800 headset. The transmitter/ base station sprang into life properly and seemed to be working fine, my PC recognised it as an audio device etc.

However, on turning the headset on, the base station gets the 'connected' message briefly before glitching out and restarting, which disconnects the headset and starts off a never ending loop of connecting, crashing and reconnecting.

I've done a reset on the base station and have left the battery out of the headset for a couple of days, but I still have the same behaviour.

It's also the same when plugged into a different PC, or even when not connected to a source at all (just using the usm power supply)

My last hope is to try and update the firmware on the base station, but I can't find anything other than the GG suite which doesn't recognise the hardware at all. Is there some legacy cache of firmware somewhere that I've missed?