Bluesound Pulse doesn't work after last upgrade

Hi,

All was working fine with my 2 Pulse wifi connected but i accepted today morning the upgrade of blueOS. After 30 mn one of my pulse doesn't work. No light red or green or blue. The other Pulse work fine and the app is V4.

I connected the pulse with an ethernet cable to my box. I had a little light above the ethernet port, first yellow and now red. But after more than 1 hour it no change.

What can i do ?