262 lines
9.8 KiB
Markdown
262 lines
9.8 KiB
Markdown
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nmrpflash - Netgear Unbrick Utility
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====================================
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`nmrpflash` uses Netgear's [NMRP protocol](http://www.chubb.wattle.id.au/PeterChubb/nmrp.html)
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to flash a new firmware image to a compatible device. It has been successfully used on a Netgear
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EX2700, EX6100v2, EX6120, EX6150v2, DNG3700v2, R6100, R6220, R7000, D7000, WNR3500, R6080, R6400
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and R6800, R8000, R8500, WNDR3800, WNDR4500v3 but is likely to be compatible with many other Netgear
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devices.
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Prebuilt binaries for Linux, macOS and Windows are available [here](https://github.com/jclehner/nmrpflash/releases)
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([Npcap](https://nmap.org/npcap/#download) is required on Windows). FreeBSD packages can be fetched and installed using the
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FreeBSD `pkg` command.
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```
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Usage: nmrpflash [OPTIONS...]
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Options (-i, and -f or -c are mandatory):
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-a <ipaddr> IP address to assign to target device [10.164.183.253]
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-A <ipaddr> IP address to assign to selected interface [10.164.183.252]
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-B Blind mode (don't wait for response packets)
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-c <command> Command to run before (or instead of) TFTP upload
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-f <firmware> Firmware file
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-F <filename> Remote filename to use during TFTP upload
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-i <interface> Network interface directly connected to device
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-m <mac> MAC address of target device (xx:xx:xx:xx:xx:xx)
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-M <netmask> Subnet mask to assign to target device [255.255.255.0]
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-t <timeout> Timeout (in milliseconds) for NMRP packets [10000 ms]
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-T <timeout> Time (seconds) to wait after successfull TFTP upload [1800 s]
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-p <port> Port to use for TFTP upload [69]
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-R <region> Set device region (NA, WW, GR, PR, RU, BZ, IN, KO, JP)
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-S <n> Skip <n> bytes of the firmware file
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-v Be verbose
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-V Print version and exit
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-L List network interfaces
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-h Show this screen
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```
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### Using nmrpflash
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Download the correct firmware image for your device. When downloading from the Netgear site,
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the firmware is usually contained in a `.zip` file - extract this first. The actual firmware
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file will have an extension such as `.chk`, `.bin`, `.trx` or `.img`.
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Now, using an Ethernet cable, connect your Netgear router to the computer that will run
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`nmrpflash`. Use the LAN port, which is often colored blue on Netgear devices. If the
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router has multiple LAN ports, use the one labled `1`.
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Next, you'll have to determine which network interface corresponds to the one connected to
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the Netgear router. All available interfaces can be listed using
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```
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# nmrpflash -L
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eth0 192.168.1.2 c0:de:fa:ce:01:23
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eth2 0.0.0.0 ca:fe:ba:be:45:67
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wifi0 10.0.10.138 de:ad:be:ef:89:ab
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```
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For the rest of this example, let's assume that your router is connected to `eth2`, and that
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you want to flash a firmware image named `EX2700-V1.0.1.8.img`.
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First of all, turn *off* the router. Then start `nmrpflash` using the following command:
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```
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# nmrpflash -i eth2 -f EX2700-V1.0.1.8.img
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Waiting for Ethernet connection (Ctrl-C to skip).
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```
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As soon as you see the `Waiting for Ethernet connection.` message, turn the router *on*. If all went
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well, `nmrpflash` will continue printing messages:
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```
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Advertising NMRP server on eth2 ... /
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Received configuration request from fe:ed:1b:ad:f0:0d
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Sending configuration: 10.164.183.252/24
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Received upload request: filename 'firmware'.
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Uploading EX2700-V1.0.1.8.img ... OK (3539077 b)
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Waiting for remote to respond.
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Received keep-alive request (11).
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Remote finished. Closing connection.
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Reboot your device now.
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```
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Now reboot the device, and you're good to go.
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### Common issues
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**In any case, run `nmrpflash` with `-vvv` before filing a bug report!**
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###### "Error while loading shared libraries: ..." (Linux)
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You must install your Linux distribution's `libpcap` and `libnl-3`
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packages (exact names will vary depending on your distribution).
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On Debian based distros (such as Ubuntu) you can install these dependencies with
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sudo apt install libpcap libnl-3
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###### "The program can't start because wpcap.dll is missing" (Windows)
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Install [Npcap](https://nmap.org/npcap/). For `nmrpflash` versions prior
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to 0.9.14, install Npcap with "WinPcap Compatibility" enabled.
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Version 0.9.13 was the last version to support Windows XP.
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###### "nmrpflash cannot be opened because the developer cannot be verified." (macOS)
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Go to ` -> System Preferences -> Security & Privacy`. Under the `General` tab, there should
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be a message like "nmrpflash was blocked from use because it is not from an identified
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developer". Click the `Allow anyway` button next to it, and run `nmrpflash` again.
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If that doesn't work, try [this](https://support.apple.com/guide/mac-help/open-a-mac-app-from-an-unidentified-developer-mh40616/mac).
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###### "No suitable network interfaces found."
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Make sure the network interface is up (wireless interfaces are not supported).
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On Windows, try restarting the Npcap service (commands must be run as
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administrator):
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```
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C:\> net stop npf
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C:\> net start npf
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```
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###### "No response after 60 seconds. Bailing out."
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The router did not respond. **Always run `nmrpflash` in the sequence
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described above!**
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You can try specifying the MAC address using `-m xx:xx:xx:xx:xx:xx`,
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or, if that still doesn't work, "blind mode" using `-B`. Note that
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careful timing between running `nmrpflash` and turning on the router may
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be required in this mode.
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It's also possible the bootloader itself is bricked, or that the
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particular device does not support the NMRP protocol.
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###### "Timeout while waiting for ACK(0)/OACK."
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The device did not respond to `nmrpflash`'s TFTP upload request. By default,
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`nmrpflash` will assign `10.164.183.252` to the target device, while adding `10.164.183.253`
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to the network interface specified by the `-i` flag. You can use `-a` to change the IP
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address assigned to the target (e.g. if your network is `192.168.1.0/24`, specify a *free*
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IP address, such as `-a 192.168.1.252`), and `-A` to change the IP address used for the
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network interface.
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###### "Timeout while waiting for CLOSE_REQ."
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After a successful file upload, `nmrpflash` waits for up to 15 minutes for an
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answer from your device. You can increase this by specifying a longer timeout
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using `-T` switch (argument is in seconds).
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It's entirely possible that the image was flashed successfully, but the
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operation took longer than 15 minutes.
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###### "Address X/Y cannot be used on interface Z."
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`nmrpflash` refuses to use an IP address / subnet mask combination that would
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make the remote device unreachable from the device running `nmrpflash`. For
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example, if the IP address of your computer is 192.168.0.1/255.255.255.0, assigning
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192.168.2.1/255.255.255.0 to the router makes no sense, because the TFTP upload will
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fail.
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###### "IP address of X has changed. Please assign a static IP to the interface."
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This can happen if the network interface in question automatically detects that
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the network cable has been connected, and your computer tries to reconfigure that
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interface (NetworkManager on Linux does this for example) - this can usually be
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disabled.
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###### "Received keep-alive request."
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This usually means that flashing is in progress. On some devices, you may get a few
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hundred keep-alive requests before it eventually finishes!
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###### "TFTP block rollover. Upload might fail!"
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By default, file transfers using TFTP are limited to `65535 * 512` bytes
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(almost 32 MiB). Uploading files exceeding this limit might fail, depending
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on the device. If it does fail, your only option is flashing an older image,
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which is smaller than 32 MiB.
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###### "Ignoring extra upload request."
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Extraneous upload requests are usually sent by the device if the image validation
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failed. Some possible causes are:
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* If you downloaded a firmware that's contained in an archive (a `.zip` for
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example), you must extract this file, and then use the contained firmware file
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as the argument to the `-f` parameter. Some examples for file extensions used
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for firmware: `.chk`, `.bin`, `.trx`, `.img`.
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* Some devices prevent you from downgrading the firmware. See if it works with
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the latest version available for your device. If you're already using the latest
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version, it might be possible to patch the version info of the firmware file. A
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future version of `nmrpflash` might incorporate an auto-patch feature for these
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cases.
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* Your device might expect a different image format for `nmrpflash` than when
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flashing via the web interface.
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###### "Timeout while waiting for 0000." after "Waiting for remote to respond."
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This could indicate that the device hasn't finished flashing, after the default timeout
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(15 minutes`). Try increasing the timeout, using the `-T <seconds>` option,
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for example use `-T 1800` to specify a timeout of 30 minutes.
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###### "bind: Cannot assign requested address"
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Specify the address of the router (`-a`), and address of your computer (`-A`).
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For example:
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`-A 10.0.0.2 -a 10.0.0.1`
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or
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`-A 192.168.1.2 -a 192.168.1.1`
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### Building and installing
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###### Linux, Mac OS X, BSDs
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On Linux, developer packages for `libpcap`, `libnl` and `libnl-route` must be installed:
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```
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$ sudo apt install libpcap-dev libnl-3-dev libnl-route-3-dev
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```
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Then, it's as easy as
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```
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$ make && sudo make install
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```
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On FreeBSD (assuming the ports infrastructure is installed and you have root permissions):
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```
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$ cd /usr/ports/sysutils/nmrpflash
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$ make install
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```
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Or install the FreeBSD binary package with:
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```
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$ pkg install nmrpflash
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```
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###### Windows
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The repository includes a
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[CodeBlocks](https://www.codeblocks.org/)
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project file (`nmrpflash.cbp`). Download the latest
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[Npcap SDK](https://nmap.org/npcap/)
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and extract it into the a folder named `Npcap` in the source's root
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directory.
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### Donate
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You can [buy me a coffee](https://www.buymeacoffee.com/jclehner) if you want, but please consider
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donating the money for charity instead - [Médecins Sans Frontiers](https://www.msf.org/donate) comes to mind,
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but any other organization, local or international, that you think deserves support will do. Thank you!
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