Rebel XT / 350D [URL]http://web.canon.jp/Imaging/eosdigital2/e3kr2_firmware-e.html[/URL] EOS-1Ds Mark II [URL]http://web.canon.jp/Imaging/eos1dsm2/eos1dsmk2_firmware-e.html[/URL] EOS-1D Mark II [URL]http://web.canon.jp/Imaging/eos1dm2/eos1dmk2_firmware-e.html[/URL] I upped my XT to 1.0.2 following the instructions and encountered no problems.