You should be able to just run the OTA updater right? (I am assuming you are using x86/Rpi)
Look at Important notice to all Volumio 2.xxx users, firmware update needed! for some alternative ideas - but the recommend route is the OTA 
You should be able to just run the OTA updater right? (I am assuming you are using x86/Rpi)
Look at Important notice to all Volumio 2.xxx users, firmware update needed! for some alternative ideas - but the recommend route is the OTA