how to flash it under openwrt?
it is not in the list of supported devices on the site, but the router itself is defined in the network connection as an openwrt router, but the firmware is not original but Chinese and it is not possible to get higher than 135 Mbit per download on it, although the ports are gigabit, and the aggregation of the speeds of two providers. Updating the firmware from off-site did not solve these problems.
Physical interface：310/100/1000Mbps LAN /WAN Port. 110/100/1000Mbps WAN Port. 110/100/1000Mbps LAN Port.
1DC Power Port. Button : 1Reset Button. 1Power ON/OFF Button. Power : 12V/1A. Indicator:Power,SYS