Canon has recently released firmware update 1.2.1 for the EOS 5D Mark III.
There are currently some reports about “dead” cameras when trying to update the EOS 5D Mark III with an Eye-Fi SD card.
In these cases the users never got the option in the menu to update the firmware and press “OK” to continue, but the camera got “dead” (“frozen” in fact), non responsive for long time.
Please note that the firmware update 1.2.1 fixes list states in point 9:
“9. Fixes a phenomenon in which the camera may not function properly when an Eye-Fi card is used.“
This problem is probably fixed in the new firmware, but you still have a previous firmware to update, so the Eye-Fi SD card may not work properly.
So our suggestion is:
Do NOT use Eye-Fi SD cards to update the firmware.
This simple precaution should avoid this inconvenience.
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