CR10 S5 with V4.2.7 Motherboard and Nebula Smart kit and Cr Touch

So as is I have a Cr10 S5. tonight I swapped out the motherboard from a V2.2? to a V4.2.7 with a splitter to run the two z motors?
I connected the Nebula, camera and added ender 3 Firmware but am not getting passed connecting and the app wont detect. says there is an anomaly when I get that far. Is there a better firmware to run as cr10s5 isnt covered. Ive challenged Ai and it recons this should be possible. Ive seen youtube vids of the motherboard upgrade and Ive been informed once in a specific Ender or CR profile I can change the bed size to match the cr10s5 500x500. Thanks in advance
Jen.