Hello.. I did also went into the local Mahangeet web page before to reset the device locally. the Connectivity was finally restored, but this issue was not connectivity neither local configuration... something was odd with the dashboard.
I was able to connect another device to the Gateway and get an IP
What I finally did after 2 oe 3 hours of work
Got an IP on another device
at the dashboard set that IP for the WAN1 port
rebooted
dashboard was still showing a previous IP at General configuration other than the one set manually on WAN1
waited some minutes entered to dashboard and set the IP to Automatic (WAN1)
and ... finally the device .. automatically udated their information on the dashboard and connectivity restored.
FRCG