Is this not it here?http://www.tenvis.com/web/firmwaredownload.html
Edit: I have tried this firmware, and it works well for me. But read on before you try it...
I have a
Wanscam FI8908W clone from eBay (seller: homegarden2012). However, I spotted this difference in the boot messages:
Foscam and many others: "usb.c: registered new driver rt73"
My cam: "usb.c: registered new driver rt2870"
So it seems I have a different WiFi chip to the norm. Which firmwares have which WiFi driver in them is not well documented. So I have tried most of the ones in the FILES section. For example, the Foscam ones worked well with my cam, but no WiFi.
The only ones that seem to use rt2870 are Uvision & Wansview-nc541w, but for me the pan/tilt didn't work with these. (So if anyone with a normal Foscam tries these firmwares, the WiFi won't work!)
Then I loaded the latest Tenvis firmware (linked above) and everything is working 100% for me now - except there's no mention of audio support. The WebUI looks different from the original, but it works. So the Tenvis uses rt2870 too.
So, as an incomplete summary from my experimentation:
I hope this helps someone.