I'm really sorry for your troubles. Could you describe your stability problems in detail? Which router are you using? Are you using any switches? Devialet never releases any firmware files, so you're probably out of luck. Have you contacted Devialet Support? They can push the firmware to your speakers if they want to.
Living room: Sigberg Audio Manta/10D subs, MiniDSP SHD Studio.
Den: Sigberg Audio SBS.1/Inkognito subs, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage
Den: Sigberg Audio SBS.1/Inkognito subs, MiniDSP SHD Studio.
In the cupboard: Some bits and pieces of a Phantom Silver 1. gen.
My Phantom Voyage

