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LP128's avatar
LP128
Tutor
Sep 19, 2019
Solved

R6400v2 bricked after firmware update

I clicked the update firmware button on routerlogin.net, waited about 30 minutes, and nothing happened.  Now my router's power button just flashes red.  I downloaded the latest firmware and tried to ...
Firmware
  • LP128's avatar
    LP128
    Sep 20, 2019

    I got it to work using a different tool: https://github.com/jclehner/nmrpflash

    I downloaded the oldest version of my router's firmware (R6400v2-V1.0.2.14_1.0.7.chk) from https://www.netgear.com/support/download/ into the same download location as nmrpflash.


    I unplugged the router's WAN and plugged my computer into the router's LAN port #1.

    Opened Control Panel\Network and Internet\Network Connections
    right clicked "Ethernet"
    clicked "Properties"
    double clicked Internet Protocol Version 4 (TCP/IPv4)

     

    switched to a static IP address:
    IP Address: 192.168.1.10
    Subnet mask: 255.255.255.0
    Default gateway: 192.168.1.1

     

    I opened a command prompt as administrator, and changed to my download directory for nmrpflash:
    cd C:\Users\LP128\Downloads

     

    then typed the following to view a list of my network connections (I typed the command as shown, without a preceding pound sign):
    nmrpflash -L

     

    It showed that 192.168.1.10 (Ethernet) was the net2 connection

     

    Then I turned off my router, and typed the following without pressing enter:
    nmrpflash -a 192.168.1.1 -i net2 -f R6400v2-V1.0.2.14_1.0.7.chk

     

    I pressed enter, and immediately turned on my router. I had to try four times before I got the timing correct.

     

    When the it worked successfully, the command prompt displayed this:
    Advertising NMRP server on net2 ... \
    Received TFTP_UL_REQ while waiting for CONF_REQ!
    Received upload request without filename.
    Uploading R6400v2-V1.0.2.14_1.0.7.chk ... OK
    Waiting for remote to respond.
    Received keep-alive request.
    Received keep-alive request.
    Received keep-alive request.
    Remote finished. Closing connection.
    Reboot your device now.

     

    ("Received keep-alive request." was actually repeated 26 times. I shortened it here.)

     

    I rebooted the router, and after a couple of minutes the power indicator turned white.

    I plugged the WAN back into the router.

    I went back to my computer's ethernet properties and changed the IP address back to automatic.

    Downloaded the latest firmware from https://www.netgear.com/support/download/

    Went to routerlogin.net, and upgraded the firmware to this latest version under Advanced - Administration - Router Update

antinode's avatar
antinode
Guru
Sep 19, 2019

> I'm using Windows 10. [...]

 

   Thanks for the details.  That all looks plausible to me, right down
to the byte count, assuming that the router really is a R6400v2.  (And
I'm willing to believe that you can read the product label.)

 

   I might try it with a less elaborate start sequence.  For example,
ignore the Reset button, and just apply power.

 

> [...] I waited over 30 minutes. [...]

 

   After the transfer, the LEDs should do different things, and, within
a few minutes, a normal start-up should follow.

LP128's avatar
LP128
Tutor
Sep 20, 2019

I got it to work using a different tool: https://github.com/jclehner/nmrpflash

I downloaded the oldest version of my router's firmware (R6400v2-V1.0.2.14_1.0.7.chk) from https://www.netgear.com/support/download/ into the same download location as nmrpflash.


I unplugged the router's WAN and plugged my computer into the router's LAN port #1.

Opened Control Panel\Network and Internet\Network Connections
right clicked "Ethernet"
clicked "Properties"
double clicked Internet Protocol Version 4 (TCP/IPv4)

 

switched to a static IP address:
IP Address: 192.168.1.10
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1

 

I opened a command prompt as administrator, and changed to my download directory for nmrpflash:
cd C:\Users\LP128\Downloads

 

then typed the following to view a list of my network connections (I typed the command as shown, without a preceding pound sign):
nmrpflash -L

 

It showed that 192.168.1.10 (Ethernet) was the net2 connection

 

Then I turned off my router, and typed the following without pressing enter:
nmrpflash -a 192.168.1.1 -i net2 -f R6400v2-V1.0.2.14_1.0.7.chk

 

I pressed enter, and immediately turned on my router. I had to try four times before I got the timing correct.

 

When the it worked successfully, the command prompt displayed this:
Advertising NMRP server on net2 ... \
Received TFTP_UL_REQ while waiting for CONF_REQ!
Received upload request without filename.
Uploading R6400v2-V1.0.2.14_1.0.7.chk ... OK
Waiting for remote to respond.
Received keep-alive request.
Received keep-alive request.
Received keep-alive request.
Remote finished. Closing connection.
Reboot your device now.

 

("Received keep-alive request." was actually repeated 26 times. I shortened it here.)

 

I rebooted the router, and after a couple of minutes the power indicator turned white.

I plugged the WAN back into the router.

I went back to my computer's ethernet properties and changed the IP address back to automatic.

Downloaded the latest firmware from https://www.netgear.com/support/download/

Went to routerlogin.net, and upgraded the firmware to this latest version under Advanced - Administration - Router Update