Sorry.

Windows 10

cgminer 3.1.1

cgminer.exe -o stratum+tcp://stratum.f2pool.com:8888 -u xxxxxxxxx -p xxxxxxx -S //./COM5 --chips-count 256 --ltc-clk 234 --ltc-debug --nocheck-golden

exactly same for the smaller rig except for the  chip count and clock numbers - that works fine

drivers should be ok as the other rig works.

Never used BFG couldnt get either to work on that

thanks