I edited everything with "SPEEDLOCK" in the name in the head unit.
Every speedlock entry with "condition" in the name, disable it. Set it to "nicht_aktiv" or "none".
Set ""speedlock_speedvalue" entries (...min and ...max) to 0 km/h
Set SPEEDLOCK_FREISCHALTMENU to "
aktiv"!
"freischaltmenu" means "unlock menu", so this has to be set to "aktiv" (=active)
After coding, you have to open this unlock menu:
- go to the iDrive homescreen
- push and hold the idrive controller up/forward
- while holding, push in sequence: Media > Home > Media
The unlock menu will appear. Select "deactivate Speedlock".
I found a video which describes the process very well: