Nuki Bridge connection

I have a connections issue between nuki bridge and my smart lock. I followed all the solution to reestablish the connection, but the issue is not solved. I mentioned that when I want to reestablish the connection , the light on the nuki bridge is not functioning after tapping it for more than 5 seconds and it is on the socket, near to smart lock. Could be the nuki bridge fault?

PS. the last day I made the update of firmware for smart lock at the version 2.6.6 for Android app. Could be the problem with this?