Upgrade completed,
Following first boot got osmc home screen but wireless mouse/keyboard wouldn't work.
Hard rebooted with power cycle and same result.
Went and got wired keyboard and connected and hard reboot again, won't start now.
Getting 4 green flashes and no hdmi output (on tv or lcd monitor w/ hdmi to dvi cable)
Edited config.txt which was blank via sd card reader to ensure hdmi_force_hotplug=1 was set, and tried a few more times but still nothing coming up on screen
According to google, 4 green flashes means start_x.elf not launched
Currently restoring to my SD card backup from before I switched to Leia and will try an upgrade again


