I see many many cars with the very latest 40.50.x loads with varying AP versions.
Don't fully trust Teslafi's breakdown because the selection of the AP hardware is performed by the user, which in several cases doesn't know anything about which version is installed in their car. For instance I see a lot of Model 3s with hardware 2 or Pre-Autopilot, which is impossible.
Only few AP2.0 or AP1 seem to have gotten the upgrade, but I actually think none of them really is AP2.0 or AP1.
By only trusting big numbers, I see about 86% of AP2.5 who got the 40.50.x upgrade which lets me think that only AP2.5+ get it, since (if I'm not wrong) a slice larger than AP2.5's 14% has MCU1 (not even taking into account the guys refusing the upgrade, which is surprisingly non negligible).
Again, I might be wrong, but it would be nice if any AP2.0- or MCU1 fellow who got the upgrade could speak up.