There's an open source version of the software that, I don't think, is official but works well. It can rebind, set RGB, change DPI settings, and most if not everything the official software can.
Corsair mice aren't the best, and the problems seem to be certain versions of their mice. (M65 is garbage. I went through 6 of them in 6 months.)
Nightsword has been great though.
Scimitar is good as well, have one that's 6 years old now.