2016 focus st - non start help needed

[Sanj Singh]

Hi, I'm new to the forum and to forscan and need some help. I have a 2016 ford focus st diesel that i purchased from copart damaged, it looked minor but once it was delivered It had the ecu hanging off and the plugs damaged so I changed the full engine loom and whilst doing this I found it had broken the neutral position sensor on the gearbox so I replaced that aswell and this got the car to the stage it would crank and not start. I removed the bcm to check for damage and once refitted it now won't crank again. The fault codes are as follows and I have tried to erase all but they come back:
B1206 crash detected pcm - clears but comes back on
B108b start button a signal low - no visual damage
P027c fuel pump control module b circuit low - replaced but still the same
I have fuel coming to the filter when the ignition is turned on and have tried the ignition on 30 seconds to reset with no luck , is there any other way to reset the inertia switch as it does seem like the fuel has been cut off or am I missing something?
Any help or advise would be appreciated