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The 4K$\times$4K CCD Imager is the first light instrument for the 3.6mDevasthal Optical Telescope and is producing broad-band imaging observations ofmany Galactic and extra-galactic sources since 2015-2016. Capabilities of theCCD Imager are demonstrated recently through several publications using thewell-calibrated multi-band deep photometric results as expected from othersimilar facilities globally. In this article, we summarize some of the recentup-gradations made to improve the Imager, i.e., mounting the new filter wheelcasing, replacing stray light baffles and discussing the fringe patterncorrections in redder filters. Some of the new science initiatives likegalaxy-embedded faint point sources including WR stars and the observations oflow surface brightness galaxy clusters are also discussed.

4K$\times$4K CCD Imager for the 3.6m DOT: Recent up-gradations and results