@Kevin_Z That seems like the solution! I restarted all my Deco E4 units unplugging from power supply (because restarting via app wasn't possible), then I restarted deco app and finally the system...

Kevin_Z wrote @ItaliaKev @lorenzo89 @Xray Hello all, sorry to respond late. Are you all using Deco M4? Is it running the latest firmware? When does this issue happen, after you upgrade the Deco app...

the same for me! nothing works in this app anymore, it suddenly became useless. No devices online and no setting shown, but we have no other way than this app to control our wifi network....