Posted: Sun Aug 24, 2014 14:31 Post subject: De-bricking a Netgear WNR2000v2 with serial
Hi All,
After trying a few different methods and reading lots of posts, I purchased a USB to TTL adapter and made up a serial cable for this WNR2000v2. I can now get into the CFE> prompt, but following the instructions in http://www.dd-wrt.com/wiki/index.php/Serial_Recovery I get an odd "Checksum mismatch" and an "Invalid Boot block on disk". The rooter then reboots into a TFTP server mode.
I have tried TFTPing a stock firmware as advised (tried both V1.0.0.34_29.0.45 and V1.2.0.6_36.0.5, but its a no go.
After you stop the cfe type help.
I can't remember for sure but I think you need to type "tftpd" or something like that to transfer the firmware. Not flash -noheader : flas1.trx.
I could be wrong. It's been a whle since I did one of these. _________________ I am far from a guru, I'm barely a novice.
Secondly, running 'tftpd' does indeed start the TFTP server and you can transfer the file, however, the router just sits there asking for another file. There is no way to brake out of this, so you need to hard re-boot the router. This is pretty much the same as when the router reboots again, and goes straight into the TFTP server.
Secondly, running 'tftpd' does indeed start the TFTP server and you can transfer the file, however, the router just sits there asking for another file.
You may have tried this, but...
My router did something similar to this and it wouldn't recover until I tftp'd the file TWICE. I had to do it once to get things rolling and a second time when it got to the "Reading ::" prompt again. My guess is, you're screwed, but it's worth a shot if you have not tried sending it twice.
I have a feeling I have tried this (maybe even three times!), but will give it another go tonight.
My feeling is that the checksum is failing because it thinks that the hardware MAC address on the Ethernet adapter is wrong (showing as 00:FF:FF:FF:FF:FF). I don't ever remember resetting the MAC address as the router was used mainly as an access point.
Joined: 26 Jan 2008 Posts: 13049 Location: Behind The Reset Button
Posted: Wed Aug 27, 2014 13:58 Post subject:
swinster wrote:
I have a feeling I have tried this (maybe even three times!), but will give it another go tonight.
My feeling is that the checksum is failing because it thinks that the hardware MAC address on the Ethernet adapter is wrong (showing as 00:FF:FF:FF:FF:FF). I don't ever remember resetting the MAC address as the router was used mainly as an access point.
The board_data partition has been wiped out. That is why you have no mac's. I believe there are several threads about the forum in regard to rebuilding / restoring the partition. _________________ [Moderator Deleted]
From the previous post (although this relates to a WNDR3300 no a WNR2000v2), I thought I would try a few things.
However, some CFE command seem missing.
First, there is no CFE help, and pressing TAB doens't bring up anything.
Second, there is no "setenv" command to set the board_ID - which I think I have found out as being U12H114T00_NETGEAR
Third, the MAC address of label has been demolished on the back of the router along with the serial number!
Forth, I did try 'borrowing' a MAC address from another user WNR2000v2 serial print out and ran 'ifconfig eth0 -hwaddr=C03F0E947C5A -addr=192.168.1.1'. Whilst this seemed to take, when I flashed the stock firmware using the commands above and rebooted, I still end up on the TFTP reading prompt and the MAC has reverted to 00-FF-FF-FF-FF-FF
BTW, the 'Show' command exists but 'show devices' doesn't and I can hit any other options for 'show'
From what I'm reading, I need a GOOD wholeflash file from a WVN2000v2, then hack it around to flash to this device. DOes anyone know where I might get hold of one of those?
, but its a no go.
