  We report on the upgraded One Degree Imager (ODI) at the WIYN 3.5 meter
telescope at the Kitt Peak Observatory after the focal plane was expanded by an
additional seventeen detectors in spring 2015. The now thirty Orthogonal
Transfer Array CCD detectors provide a total field of view of 40' x 48' on the
sky. The newly added detectors underwent a design revision to mitigate reduced
charge transfer efficiency under low light conditions. We discuss the
performance of the focal plane and challenges in the photometric calibration of
the wide field of view, helped by the addition of telescope baffles. In a
parallel project, we upgraded the instrument's three filter arm mechanisms,
where a degrading worm-gear mechanism was replaced by a chain drive that is
operating faster and with high reliability. Three more filters, a u' band and
two narrow band filters were added to the instrument's complement, with two
additional narrow band filters currently in procurement (including an H-alpha
filter). We review the lessons learned during nearly three years of operating
the instrument in the observatory environment and discuss infrastructure
upgrades that were driven by ODI's needs.
