My last U3 just died. I can see it with zadig and reinstall the driver, but it does not get recognized by cgminer, nor is the R1 able to fire it up as a controller. The red USB led lights up, but that's it. It will no longer hash no matter what I do. RIP U3.
Yours may just be dead/defect also, zOU.
And as usual it's never the users fault and bitmain sent you a crappy u3 right?
I don't want to say it's your fault but chances are you overclocked it behond safe parameters even though you might not admit it.
Not sure where this attack is coming from... I have run my U3 well within its operating parameters for the entirety that I have owned it. For the last several months that has been 785volt 237.5freq, well well below not only the maximum values, but below bitmains recommended settings as well (which you can find in this thread if you dig back far enough). I can assure you this was not user error, for months it "worked just fine"*, then suddenly it will no longer hash. The U3 is a piece of shit, this is no secret, so a sudden failure comes as no surprise to me.
*there is no such thing as a U3 that works just fine