Canon released the newest firmware update for 5D Mark II users today aiming to correct some minor issues. Firmware 2.0.9 includes the following fixes.
1. Improves writing/reading speeds when using UDMA 7-compatible CF cards.
2. Fixes a phenomenon where the IS function will not work when custom function C.Fn III-2 is set to [5: IS start] and the lens attached does not have an AF stop button. This is because custom function C.Fn III-2 allows users to assign IS start to the AF stop button on the lens
3. Corrects misspellings in the menu screens displayed in Arabic, Portuguese, Spanish, and Thai languages.
Download the update HERE