I just completed replacing mine. Used a cheap smartphone borescope to help find the TDC locking hole. Image below.
Primed for 3 minutes with ISTA ... no start. Primed for another 3 minutes .... no start. Found low rail pressure error code. Primed again and cracked injector line #1 during. Bubbles came out and closed it once it was just fuel coming out. Car started up. Soooooooo relieved.
https://f30.bimmerpost.com/forums/at...1&d=1563251936