Lost access to the device is not visible by Ip

HI, Router D-link 2760U . It is no longer visible by IP, Wi-Fi does not distribute IP . How can I restore the IP through the UART?

Could you clarify how this is related to openwrt? Your device does not appear to be supported by this project.

This device has the Openwrt firmware for the 2650U. For a long time everything worked well and 2 days ago the router stopped responding to the network.

Have you tried failsafe mode?

https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset