This is how you downgrade the firmware on a Canon camera
How To Update Canon EOS Camera Firmware - YouTube
Canon EOS R5 Firmware Update Version 1.8.1 Released, Featuring 400MP IBIS High-Resolution Shooting
Firmware: updates to your Canon EOS camera
Camera Firmware: How to Update It (and Why)
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Firmware upgrade adds extra functionality to Canon EOS 7D
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Canon firmware updates for EOS R System & EOS cameras - Newsshooter
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How to upgrade the firmware of a Canon EOS DSLR camera - YouTube
Canon Firmware Updates: EOS R5, EOS R6, EOS-1D X Mark III
Canon EOS R3 Firmware Update Version 1.4.1 Released
Canon R7 Firmware Update Version 1.4.0 - RF Shooters
Firmware: updates to your Canon EOS camera
EOS Cameras - Canon UK
Firmware update information & download links for Canon EOS cameras
How to Update Canon Camera Firmware - YouTube
