Canon has today released new firmware for the EOS 5D and EOS-1D Mark II N digital SLRs. The EOS 5D firmware corrects communication errors between the 5D and EOS Capture after a certain number of shots; allows the use of E-TTL flash metering mode using the ST-E2 Speedlite Transmitter in conjunction with the 580EX Speedlite; and ‘enhances’ direct printing to two Canon PIXMA Pro printers. The EOS-1D Mark II N firmware update includes only the direct printing improvement with no other bug fixes.
Canon EOS 5D firmware update
Canon EOS-1D Mark II N firmware update