Lost Braking after calibrating V2 remote

Howdy Folks!
New member, newish rider. Have done some fun repair work with a couple of secondhand GTX Bamboo's and run into an issue I haven't seen posted anywhere.

The problem: After calibrating my remote, I can't brake! At all.
Context: I've had one GTX die from water exposure and purchased a second with a busted battery. I made a Frankenboard from the mixed parts was all going good until a motor had its gear-shaft sheer off completely. After swapping to aftermarket motors I got it working again but it had pretty crappy braking. With the release of the Diablo boards, Evolve found a box of old parts containing everything I needed, so I ordered a heap of stuff. I've repaired and returned Frankie to bog standard/stock GTX (motors, new control board, fresh battery)
Still crappy braking though, so I looked through some posts and thought, "maybe it's a remote issue, hey I know! I'll try calibrating the remote!"
It did NOT work. At ALL. Now I've totally lost even the crap braking I did have.

Has anyone had this sort of issue or have a potential solution? coz I'm at a loss

Cheers peeps, hoping to hear some feedback