I purchased a new old stock replacement camera which has older camera firmware (S01777-2.0 FINAL [ID:20013] 2013-05-15). The camera appears to work fine. When connected to SX20 with CE9.12.3 the camera did not update to the last version. Usually when a camera is connected to a codec at a version that included new camera firmware, the camera would automatically update. It may be that the 2.5X camera firmware has been removed from codec versions even though the release notes indicate full support. Unfortunately older codec software that would have the camera update when it was released, can no longer be downloaded.