K-1 firmware v2.51

Improved accuracy of the star-tracking for Astrotracer shooting when “2 Type 2” is selected under Menu Item C, “6. Bulb（B）Mode Options.” Improved stability for general performance. * When this update is done, the contents of version 2.50 and earlier will be also updated. * When this update is done, you will not be able to restore back to version 2.50 or earlier. * This firmware includes open-source software. The applicable licenses are described in the text files included in the download.