
According to Canon downgrade is not possible but we think otherwise.

ML project provides links to compatible firmware versions. In this case you have to downgrade to previous (compatible) firmware version to make ML run again. However it is completely possible that this new firmware will be ignored because of lack of time. If a dev finds time to port ML to the new firmware version and changes are essential a new ML version may be there in time. Cam will not startup properly with ML card inserted. If Canon supplies a new firmware ML and new firmware version become incompatible after installation. ML builds/versions are branded for a dedicated camera and an exactly matching firmware version. That way, if something goes wrong, we have higher chances of being able to diagnose or fix the issue.Īctually, using Magic Lantern we have successfully unbricked a 5D Mark II damaged by a USB remote controller app. However, this does not represent a guarantee - use it at your own risk.Īs a precaution, the installer asks you to make a backup copy of your ROM files on the PC. In practice, we are doing our best to prevent these situations, and thousands of users are enjoying it without problems.
CANON 550D RESET SHUTTER COUNTER CODE
We believe the safest way to run Magic Lantern (or any third party camera control software) is to use custom modes - in these modes, Canon code does not save user settings to NVRAM. We did encounter such problems during development, but we were able to recover from them. We consider this a design flaw in Canon software. Imagine that your config file gets corrupted and you can't just delete it and start from scratch. Even developers of USB control software, who use Canon's own SDK, agree with this. These programs use the same API for changing camera settings (properties), and Canon code does not always check the validity of the settings before saving them to NVRAM.
CANON 550D RESET SHUTTER COUNTER SOFTWARE
The same risk is present if you use third party software for USB remote control. If Magic Lantern would set incorrect values for certain settings, this may cause the camera not to boot (even without ML).

Magic Lantern does not replace Canon code (which is stored in ROM), but it does change the settings (which are saved to a non-volatile memory).

Therefore, we can't be certain that it's 100% safe. Magic Lantern was created by reverse engineering an undocumented system that controls hardware.
