UPDATE: Canon has issued a new firmware for the 5D MKII, version 2.0.4, to fix the audio issues noted below for the 2.0.3 firmware update. Info below remains for reference, but consider it deprecated now that 2.0.3 firmware has been replaced.

Canon’s 5D MKII 24p/Manual Audio firmware has been pulled due to an audio issue, outlined yesterday in this post.

I had downloaded a copy of the 2.0.3 firmware a few days ago (message me on Twitter if you need a copy for troubleshooting and testing), and just took the time today to install and test it, as some users are reportedly seeing a black dot issue at high ISO settings in a situation where highlights are clipping. I’ve checked it on my 5D MKII body at various ISO’s above 800, in both 24p and 30p modes, and cannot replicate the black dot issue. Perhaps I’ve not found the magic mix of settings, or perhaps it only occurs on certain sensors (perhaps a sensor that had multiple hot pixels already…just speculating). At any rate, besides the manual audio issue with Custom presets, the firmware seems to be working for me. I’ve got a shoot this evening that we are using the 24p on (sync sound, so no audio concerns), so I’ll be testing it pretty thoroughly and will of course report back if I run into further issues.