I think the universe is trying to tell you to "upgrade to 2.5". 
It wouldn’t upgrade full stop mate. Sending it back and they are replacing.
ciao mi puoi spiegare come tornare ad un firmware precedente con la mcx8000? ho un amico che vuole tornare alla 2.0 grazie
the procedure is the same, if you want to go from v.2.0 to v2.5 or from v.2.5 to v.2.0?
Yes it is. You can move between them no problem at all.