I just did and read my SW versions. Seems like OS is not listed or stored as it just FF FF FF ..
My car was built Jul 2006 and the components date between Jun and Jul 2006. Here are the SW versions,
MMI (assume it is the iDrive) 6.9D.B Hex
NAV 9.3.C Hex
TEL 9.6.5 Hex
Looks like checksum rather than version #.
Anyone understand these? I am interested what SW version is in my car and whats the latest version #.