Updated but no "SOLO MODE"

Im trying to switch the MUTE to SOLO mode but nothing happens…do I need the MC device for this new feature?? (i only have the MD).

From the MUTE menu, press FUNC + YES to toggle between mute and solo.

For further information about what the new firmware provides, always read the readme txt file included in the downloaded zip file.

It wasn´t working… after updating the external clock start to be weird out of sync and when i took the MIDI cable out to reconnect it seems like it rebooted and now this SOLO function is working! After updating is it necessary to reboot??