MG Flasher Custom code.

[toybm]

Hi,
My car doesn't seem to like MGFlasher custom codes after V7.03.
If I flash any the transmission says no-go.
Now the flash would let me flash back to 7.03 and it's stuck in v7.2 = car is inoperable.

Gen 1 340ix, B58.

Does anyone have a solution?

Reached out to MG but it's the weekend and I may have to wait till Monday (it's a workday).

Thanks