WIS 15.00 General
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ME-SFI 2.8 firmware can be updated using SDS under "ME-SFI 2.8 (Motor electronics 2.8) -> Control unit adaptations -> Control module programming". However, since the update process goes online to pull latest firmware version the procedure can be done only by the dealer using their Star Diagnosis machine.
The latest software version available for ECU A1121535379 used in S350 (checked April 2015) is 30/2005.
Software Version in SDS
Software version can be read in SDS under "ME-SFI 2.8 (Motor electronics 2.8) -> Control unit version".
Software Version in SDS Quick test log
SDS initial quick test log will display AGW software version.