I work closely with RaceChip.
So, I talk to the upper management directly both in the US and Germany.
It is confirmed that they have it for M50i.
I have installed 1 for my local customer with X7 50i that used to own F90 M5 too.
Installation is not that hard. I have pictures already. Just need to find time to make the DIY.
I will create a thread on the DIY once I have them made.