Thank you very much for the tips!
I should add that i swapped some bd drives around 2 ps3`s (both K series, one on cfw 4.91 beta9 with multiman, the other is on 4.91 ofw) and in the ofw-ps3 both drives work, but in the cfw-ps3 only one of the drives works. It did seem to be a bdrive issue after...
Hello everyone! i installed 4.91.2 BETA9 and can't figure out why multiman gets stuck on a black screen.(bluray drive works fine). also, can i downgrade from beta9 to 4.90 ?