Please bear in mind that Naim are currently dealing with a backlog of email enquiries. They’re getting through them as best they can but there can be a bit of a wait before they’re able to respond properly, so your patience is appreciated.
Well, Naim tech support and I gave it several tries including redownloading the firmware update and writing it into the unit, but no dice. The solid red indicator persists, so I have offered to send the unit to them to troubleshoot if they are able to, else it’s going into the garbage bin.
I solved the same issue by doing the following:
1: Turn off the Muso (from the wall plug).
2: Press AND HOLD the reset button on the side - KEEP pressing while plugging the Muso back in.
(This will sidestep the Muso automatically going into the firmware upgrade cycle when simply turning back on).
3: Now release the reset button.
The Muso will then go into all sorts of gyrations but eventually will resolve.