Firmware 2.7.0 Bridge

I bought yesterday a combo. I set all up and bridge was working with 2.3.0. In the night it updated to 2.7.0 and now server is not connected. I try with a lot of Wi-Fi but Wi-Fi is always connected but server dot is red. No parameter changed in router. If I use iPhone as hotspot SERVER turn red. Can I revert to previous version?