You find all the details and download links of this minor Canon firmware update below :
Canon EOS R5 and EOS R6 Firmware Update 1.5.1
Firmware Version 1.5.1 incorporates the following fix:
1. Fixes an issue that in rare instances, the camera may become inoperable when shooting in the Servo AF setting while operating the <AF-ON> button.
Download the firmware update from Canon USA:
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