Long version here: [ Ссылка ]
Magic Lantern forum post here: [ Ссылка ]

Get two SD cards ready:
Card A) 1.3.6 (current firmware)
Card B) 1.2.3 (or whatever you're rolling back to)

In camera - menu - select firmware - update
- Wait for the camera to show "firmware update program"
- Watch the little red light (if you take the card out before it goes off, it won't work, take out the battery if you get stuck at the "firmware update program" screen. The red light informs you of the memory card being read/written on; as soon as it's off, take the card with the 1.3.6 out and put in the 1.2.3
- Select the firmware in the new screen, wait for it to downgrade.. Voila, you're now Magic Lantern ready

The process described has been tested and is working with no issues reported, however it is your hardware and you are modifying it at your own risk.

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