Output of serial terminal (tftp'ing the firmware to the device):
Decompressing..........done CFE for WNR2000v2 version: v1.0.18 Build Date: Wed Sep 9 14:33:22 CST 2009 Init Arena Init Devs. Boot partition size = 262144(0x40000) Found a 4MB ST compatible serial flash et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 220.127.116.11 CPU type 0x19749: 300MHz Tot mem: 32768 KBytes Device eth0: hwaddr C0-3F-0E-E8-7C-DE, ipaddr 192.168.1.1, mask 255.255.255.0 gateway not set, nameserver not set Startup canceled CFE> ^C CFE> ^C CFE> ^C CFE> tftpd Start TFTP server Reading :: Done. 3514368 bytes read
No further messages are shown. (If a working firmware image gets flashed, a message "Programming …" is shown)
—> the router is bricked from this point on
If someone doesn't want / can't handle it to solder pins on the board for a serial TTL connection, there is no way to bring the router back to live again.