Step 3: Insert a card with the earlier firmware version, close the card door and then the battery door. It won’t work unless both are done simultaneously. Step 2: When you are ready, you have to press “OK” on the update and open the battery door at the exact same time. Step 1: Insert a memory card with the latest camera version and locate “Firmware” in the menu. The other method uses one memory card at a time and requires quick reaction on your part. How To Revert a Canon Camera’s Firmware, Method #1 That said, some who tried the method reported in the comments that it worked for them, so it appears inconsistent and may or may not work on a case-by-case basis. Once you select your pick, you can close the memory card door, and press “OK” to start the installation.Īs a note, this method didn’t work for KH Cams and stopped at 73% progress every time. Step 3: The camera will now give an option to pick either of the two versions and you can select the older one. As the camera displays the latest firmware version it has installed, press “OK” and instantly open the memory card slot to insert the second memory card with the older firmware version. Step 2: Locate the “Firmware” section and click it. 
Step 1: Insert one memory card with the latest firmware version into the camera and open the settings menu.The first option involves using two SD cards.
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