Backout 722c851 (fix FIR not included in the zip)
Forum - 5D Mark III 1.2.3
Forum - 5D Mark III RAW Recording Discussion
Forum - General Help Q&A
Bug Tracker - 5D Mark III
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Firmware 1.2.3 is required if need any of those features from Canon:
- clean HDMI out
- dual monitor support (internal+external)
- AF at f/8 with teleconverters
If you don't need anything from the above list, please consider downgrading to 1.1.3.
A few ML features are not compatible with 1.2.3 (see the Features tab and the 1.1.3 forum thread). If you need any of those features, you will have to downgrade to 1.1.3.
- Format the card from the camera.
- Make sure you are running Canon firmware 1.2.3.
If you are running 1.3.3 or higher, you can downgrade with EOS Utility (instructions).
- Copy ML files on the card and run Firmware Update.
- Run Firmware Update from your ML card.
- Follow the on-screen instructions.
Magic Lantern is not approved nor endorsed by Canon in any way,
and using it will probably void your warranty.
We are not responsible for any damages to your camera.
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