Info from Alexh
OS 3.9 is 43.41.
BB2 patched it to 43.43.
That in turn was patched to
43.45 by Toni Wilen & Chris Hodges
43.45 has since been patched by Cosmos to
43.46b4
Sometime in the past 43.43 was patched by Doobrey to
44.2 but the number is deceptive as it predates 43.45.