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Details
Firmware Version 1.3.1 incorporates the following functional improvement:
1. Enables the center AF point to autofocus when the camera is used with the EF 200-400mm F4L
USM Extender 1.4X lens and an Extender, whose combined maximum aperture is f/8.
1DIIN hasn't seen an update since 2006, so kind of doubt Canon will go back farther than the Mark III generation. I guess this falls inline with the ~5 years of support they offer after discontinuation.
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