Gary: I feel your pain. MK's "organization" of the firmware files can be totally confusing -- and the fact that MK Tool doesn't know about the beta versions just makes it worse. Were you connecting directly up to the FC to update the FC firmware and directly up to the NC to update the NC firmware? I've found that works best for "major" upgrades -- that is where the numbers change. Be sure to check all, and I mean all, of the MK Tool settings for the parameter set you're planning to use (typically #3, Easy). Make sure that the Misc: Emergency Gas setting is up around 85-95% (your choice) and that the "Use Vario....." check box is checked. Andy.