The weirdest misfire ever

Hello everyone, I have a bmw 740li 2010 With an N64 6 cylinder turbo

I pointed the misfire was in cylinder 1-2 I changed the injectors in cylinder 2 with an aftermarket injector and it seems ok didn’t have any issues in cylinder 1 after replacing 2 used injectors With index 12 it didn’t work out it keep misfiring on cylinder 1 I did code all of them, i changed the hpfp as well with after market part it was mixing fuel with oil and it reading good px numbers Now i bought a new original injector index 12 I did the coding and the misfiring is still there I reset the adaptation and suddenly tge misfiring went to cylinder 6 , which is driving me insane Plugs and coils are fine And when changing the misfiring cylinder injector with another cylinder the misfire moves along with it

I’m suspecting an internal dme fault but there are no codes Also suspecting that after market injector but the injector in that cylinder has no faults what so ever, there is no air leaks whats so ever i smoke check the intake system, any help would be appreciated.