08-08-2017 03:59 PM - edited 08-08-2017 03:59 PM
08-08-2017 04:36 PM
You're out of luck. The instructions provide ample warning about not doing a firmware update unless you're certain that your battery is in good condition and fully charged. Send it to Canon. They can fix it, but you almost certainly can't.
09/26/2024: New firmware updates are available.
EOS R5 Mark II - Version 1.0.1
EOS R6 Mark II - Version 1.5.0
07/01/2024: New firmware updates are available.
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
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