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Hi all, quick back story - I've just rebuilt my N55 and I'm in the process of getting it back together. We rechecked the valve timing today (valve cover off). Then after we put it back together, we tried to start it but it wouldn't crank. We had an "engine start error" (or something to that effect) and the fuel pump was running whenever the battery was connected. We tried a bunch of things to diagnose it ( checked all plugs and connections, removed and replaced a bunch of fuses and tried connecting the battery from my Pajero) but nothing worked.
I also tried connecting to it with ISTA, but it wouldn't connect. I couldn't get the ignition on either, but when you press the key in it gave a basic info display and the "engine start error", so there is power to some places, but something isn't right.

Any suggestions?

[bsherobeid135@gmail.com]

Im not sure where to post this but im in need or some help lol
I have a n55 335i with these codes
2BC0 fuel-air mixture too lean
2FAB ignition, cylinder 4 combustion period too short
2EFE combustion misfires several cylinders detected
2F02 combustion misfire cylinder 4 detected
2EE0 misfire, several cylinders: fuel injection deactivation
2EED misfire cylinder 4: fuel injection deactivation
2774 air mass plausibility air mass too high
The car us on mhd stage 2 plugs and coils have less than a 2k miles on them
Colder plugs and upgraded coils
Would it he the injectors?
I didnt go with a really known coils brand its called trq coils but the car’s boost target is around 16.1 and its only going up to 8-9 psi with no engine lights not limp mode