Canon EOS 5D Firmware Update 1.1.0 Publisher's description
Canon EOS 5D Firmware Update 1.1.0
Enhancement of direct printing with specific printers.
Correction of the communication errors that occurred when shooting with EOS 5D and EOS Capture software after shooting about 138 shots.
Correction of the phenomenon in which the flash mode settings are changed from E-TTL to M (Manual) when EOS 5D is used in combination with Speedlite Transmitter ST-E2 and Speedlite 580EX.
This firmware update applies to cameras with firmware versions up to 1.0.5 installed. If your camera's firmware is already version 1.1.0, it is not necessary to perform this update.
It is highly recommended to always use the most recent driver version available.
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Try to set a system restore point before installing a device driver. This will help if you installed a wrong driver. Problems can arise when your hardware device is too old or not supported any longer.