So wife's 50i stalled on me after a short full throttle spurt then coming quickly to a stop.
It wouldn't restart, battery dropping to 8-9v when trying. So likely either a battery or starter issue.
Had terrible luck trying to jump start; jump packs not supplying current or not charged, skinny jumper cable just getting warm. Voltage never coming up above 12 so I could get started
So: roadside assistance and tow home to figure out later.
But; how to get into neutral when car won't start? It wouldn't shift even with key on engine off.
Fortunately I learned that BMW removed the in cabin neutral override.
On my car I have a hole drilled through the transmission under belly pan with a note and an arrow; 5mm hex label.
After a bunch of wriggling around on my back I found that without the hole you can use a ratchet with 5mm hex bit;
You can get in from the side but you need a ratchet or offset screw driver with 5mm hex (or equivalent torx bit).
Be alert! Even with parking brake on the car will lurch a bit when you get neutral engaged. I had somebody ready to yank me out from under the car while I was doing the deed and I blocked the rear tire as well.
I broke down one block from a fire department and a handful of fighters helped push to the side of the road.
Note: I almost got it started once after turning the flashers off. The drain from the hazards was keeping the battery from any voltage recovery and the only time it almost started was after the flashers were off for ten minutes or so.
Don't know what caused the initial stall no error codes so wish me luck.