Compatibility Spektrum DX2.0 and Mamba Monster

[orso76]

Hi!
I have an Haper ST converted in electric with a Mamba Monster V2 (FW 1.17), a Feigao 7XL and A123 5S2P (2 pair).
My radio is a Spektrum DX2.0 with a SR3000 receiver.
The problem is that Mamba Monster won't calibrate forward/reverse.
When I switch on the Monster (with full throttle forward on DX2.0, as Castel manual says), it play sound with all 3 lights flashing and fan spinning, but after a few seconds it stop and no give any sign of life...
The steering work fine. I try to set arming time to 2,3,4 and 5 seconds but it still not work.
I try with all possible configuration of DX2.0 throttle (from 100% to 125%) in normal and reverse mode but with any solution.
I buy the external capacitor from Spektrum (SPM 1600 voltage protector) and I'm waiting it arrive to make another test.

Anyone have a solution for this problem?

I'm italian and I'm sorry for my very poor english...

Thanks a lot,

Lorenzo