I managed to get text-to-speech working with the original firmware I had (not V2.00), but maybe I had a slightly different version of V1.00 as I bought mine in China (Teclast branded, not Delstar). Anyway, it does seem to be working.
I'll try and add the firmware to Rapidshare.
This might be of interest, too:
Code:
http://www.teclast.com/zhuanti/k6/