XSi Update:
Firmware update Version 1.0.9 incorporates the following fixes.
1.Fixes a phenomenon in which AEB (Auto Exposure Bracketing) shooting does not operate normally under specific conditions.
2.Fixes a phenomenon in which the Live View exposure simulation warning indication does not properly display during Live View shooting.
3.Fixes a phenomenon in which images cannot be played back after continuous shooting when a printer is connected to the camera or a video output terminal is used.
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New Rebel XSi Firmware Update v 1.1.0 was realized
http://web.canon.jp/imaging/eosd/firm-e/eosdigital4/firmware.html