All my S5's are running the original firmware, kano's cgminer fix & a queue setting of 1 - all run fine with p2pool. I always avoid bitmain firmware upgrades as they seem to create more problems than they fix  It's the old saying: "If it ain't broke......"

Is anyone using the Avalon 4.1's with p2pool? I'm interested in how they perform........

Tak.