Can anybody tell me which firmware version is I use 2850Vn for BE Broadband. Im not having much luck with the latest firmware with speeds and im trying to find the proper version on the draytek archive site.

Latest is 3.6.4.1 from here
ftp://ftp.draytek.com/Vigor2850/Firmware/
But you need to contact support if still having problems ... they have betas to try

Yes i know where to find it, its the firmware version im after i.e. modem code for be broadband.

EDIT Post

Try the modem codes ... they are responsible for capability with the line so give a go if will perform better for BE & your line
also give a go at Annex B firmwares ... you may win some upload ... with VDSL it does not matter the annexes
Also at latest firmware release notes states

Known Issue
For VDSL IOP issue, please contact with support@draytek.com for different VDSL
firmware.

I would say to contact the support for a beta but of course come back to your thread if any BE users recommend some better older firmware but as far i know the 3.6.4 was a fix with upload & stability compare to older ones