Bi Fury with cgminer

[rolli22]

Using 2 Bi Fury USB Miner with cgmniner 4.9.2
Using mmopol.org but got a pool diff from 2048 way to much to get any shares

cgminers readme and mmpool say
.bat
cgminer.exe -o stratum+tcp://mmpool.org:3333 -u benutzer -p x --suggested-diff 16

but cgminer says

[2015-11-12 17:58:18] cgminer.exe: --suggested-diff: unrecognized option

need help to lower the pool diff

thx

[-ck]

Close, but read the manual more carefully.

--suggest-diff <arg> Suggest miner difficulty for pool to user (default: none)

Also only ckpool based pools support this.