Can't upgrade my hobbywing 120a v2.1

[dobber]

Right, I've got the 2in1 program box plugged in and it says I have software version v1.64 in the box which it also tells me is the latest version. Once connected to the speedo it says that it's installed with v3.0_110323stock and I want to change it to v3.0_110930_mod.
I'm running a 7.5 t speed passion v3.0 in my Durango dex210

Help please as its driving me nuts!

All it says to any software is that "the current version (v3.0_110323stock) cannot be updated to the version (v3.0_110930_mod)!"