I had a problem, the router did not respond to anything, the light did not light up in any color, I start the router using the mtk_uartboot utility and root@OpenWRT# loads, then I follow the instructions (OpenWrt support for Xiaomi AX3000T - #420 by alexq) and at point 9 during reboot it gives me System halt. I don't have a backup, tell me how to restore the router to OpenWRT or to the default firmware