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.
03/26/2024: New firmware updates are available.
EOS 1DX Mark III - Version 1.9.0
12/05/2023: New firmware updates are available.
EOS R6 Mark II - Version 1.3.0
07/31/2023: New firmware updates are available.
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