You can flash any official or experimental image for BeagleBone Black to Beaglebone uSomIQ and it will work flawlessly just the same as the original board.
Official instruction how to compile Debian and Ubuntu for Beaglebone Black/Mentorel Beaglebone uSomIQ can be found here: https://eewiki.net/display/linuxonarm/BeagleBone+Black