Help resurrect the ASUS RT-N10 C1 router?

Question

ASUS

Hello.
Actually the problem with ASUS RT-N10 C1
A friend brought this router, said that he uploaded the dd-wrt firmware and after the reboot the animal died.
Signs:
-Only power is on from the diodes
-The LAN diode does not light up when the patch cord is
connected -IP does not distribute
-If you nail IP 192.168.1.2, then 192.168.1.1 does not ping
-Restoring the firmware using the RESET button does not occur
Connected to the animal via the COM port , in PUTTY it only writes:
U-Boot 1.1.3 (Jan 14 2011 - 14:41:20)
Board: Ralink APSoC DRAM: 32 kb
relocate_code Pointer at: 7fb84000
And nothing else happens.
Along the way, the friend killed the bootloader, right?
Tell me how you can resurrect the animal using JTAG?