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How to Save a bricked Buffalo WZR-HP-G300NH2 Router

I have an old WZR-HP-G300NH2 router.  The one I used before as a client bridge to expend Wifi coverage.

Recently, I tried to flash a new firmware to it through DD-WRT web flash interface. It failed after I started 10 minutes.

Then I tried to restart, 30-30-30 reset. Nothing happened.  It always goes to that continuously blinking on Diag LED (RED).  No matter how many minutes I wait.

So I thought it is bricked. Then I googled the situation. Finally, I got the answer that it is just Half-Bricked.  It means I still have a chance to save it.

Let me recorded what I did. Actually, I did two times all good. The first time I flash the OpenWRT firmware. The second, I use DD-WRT.

TFTP recovery

There are a lot of steps, please read carefully.

All the following working on my Windows 10 Pro.

1) Install a TFTP client.

I just enabled it from Windows 10 Features.

2) Disable all network cards of my Windows. Only enable ethernet card. Disabled the Windows system firewall.

Change IPv4 properties the IP to 192.168.11.2 with subnet mask 255.255.255.0, default gateway 192.168.11.1

3) One Lan cable, one end to the ethernet port of my computer, the other end to the LAN port next to the WAN port of the router.

4) Type route print to get a list of my NICs. Write down the interface number of the LAN card, in my case, it is 7.

5) Now type the following command to get the ARP bindings.

netsh interface  ipv4 add neighbors 7 192.168.11.1  02:AA:BB:CC:DD:1A

6) Run the following command. (before hitting the enter key, read the step 7)

tftp -i 192.168.11.1 put firmware-name.bin

firmware-name.bin is a fake name. Please see the last portion of the post about the firmware I used.
7) Look at the back panel of the router and hold the power plug and router.

Plug the power, watch the lights of the panel, they are all on, then all dark. The LAN port with cable is on, then off. ( Hit the enter Key now). There are only about 4 seconds for me to run the command. So I prepare the command before the step.

8) It is very fast, the firmware will be transferred successfully in a few seconds.

9) Wait at least 10 minutes for flashing the firmware.

10) The router will be restarted automatically.

11) I will remove the neighbors.

netsh interface ipv4 delete neighbors 7 192.168.11.1 02:AA:BB:CC:DD:1A

12) Remove the static IP of my ethernet card. Change it back to DHCP.

 

When my computer gets the IP address from the router. I enter 192.168.1.1 into the browser to config the router.

 

Appendix

OpenWRT 18.06.1

https://drive.google.com/open?id=1F4xS3-kKaVuPqUbuYoSLbffoe3YfSs1W

DD-WRT v3.0 r30356 std

https://drive.google.com/open?id=1CwWTNVIcXTxqSLyN7IwWFObUxpR3zCAJ

User Manual

https://drive.google.com/open?id=1iC_S87vCox84ECDA3pJYkYfPhc-3Tobm

Upgrade D-Link DIR-880L Firmware

I have my D-Link DIR-880L router for almost one and half years. I flashed the firmware to use DD-WRT one. Later I flashed back to D-Link firmware.

The latest version is 1.08 on D-Link Canadian website. I upgraded it long time ago.

On the D-Link support forum, it shows an updated version of firmware is available for EU users.  I am not sure if they are any difference between Canada edition and EU edition, on the hardware basis.

I believe the USA and Canada may use the same hardware. So I go to USA D-Link website.

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D-Link DIR-880L Router

DIR-880L Content

I bought a new Router from Costco two months ago. D-Link DIR-880L Dual Band Router AC1900. It replaced my old DIR-850L.

The most important reason, which makes me decide to buy it, is the price, $99.97. The current market price of it is $159.99 at NCIX or $189.99 at Dell.ca today.

dir-880l-price

The second important reason is that it is AC1900.

Let me show you the difference between AC1200 and AC1900

AC1200: 300 + 867

AC1900: 600 + 1300

There is a chart compared DIR-850L with DIR-880L side by side.

dir850l-vs-dir880l

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Wifi Standard 802.11ac

802.11ac is main stream as well as 802.11n.

Because 802.11n has better distance and more power to pass-through wall. But 802.11ac is much fast than 802.11n.

802.11ac Technology Overview:

11n Specification:

  • 2.4 and 5Ghz  Supported
  • Wider channels 40MHz
  • Better modulation 64QAM
  • Additional streams up to 4 streams
  • Beam forming
  • Backwards compatibility, with 11a/b/g

11ac introduces:

  • 5GHz supported
  • Even wider channels 80Mhz and 160 Mhz
  • Better modulation 256 QAM
  • Additional streams up to 8
  • Beam forming
  • Backwards compatibility with 11a/b/g/n

Wider Channels:

80MHz channels is 4.5x faster than 20MHz

 

Now 802.11ac v2 is comming. Also called wave 2. It is expected to be available in 2015.

Here is some highlights of wave 2 802.11ac.

MU-MIMO

  • Use AP MIMO resources more effectively
  • Transmit data to multiple devices simultaneously.

4×4:4SS

  • Benefit of additional stream mostly for MU-MIMO
  • Not anticipating any 4×4:4SS client devices
  • Adds 33% to max datarate

VHT160

  • Double s max datarate
  • Practical problem: only 2 VHT160 channels in entire 5GHz band

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Upgrade Dir-850L router firmware to v1.13

It is time to upgrade router firmware.

There is a alert notice on the support.dlink.ca

Security Advisory: New firmware has been released that fixes the latest HNAP Privilege Escalation Vulnerability. Please ensure to upgrade your router to the latest firmware version. Click on on the Downloads tab below.

What kind of vulnerability this time?

Here is a detailed information page about it. http://www.dlink.com/uk/en/support/support-news/2015/april/13/hnap-privilege-escalation-command-injection

 

An attacker who wishes to gain access to the router sends an unprivileged HNAP command such as GetDeviceSettings, they append to the command an additional command separated with an “/”, which is used as a separator between commands.  Any command(s) after the first will be executed unauthenticated.  Additionally, additional commands will be passed directly to the underlying Linux system, allowing the injection of arbitrary system commands.

The GetDeviceSettings HNAP Command is used to indicate some very common parameters (e.g. the domain name of the HNAP device), as well as to define which HNAP commands are available.

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Upgrade firmware of D-Link DIR-850L

Now it is time to upgrade D-Link router 850L to new version, 1.12WW.

Here is official download link

Look at the release notes:

Firmware: FW1.12.B05(Release)
Hardware: A1
Date:2014/10/06
Note:
1. Update CN channel table
2. Support No-IP DDNS server
Problems Resolved:
1. Fix gmx mail server issue.
2. Fix WAN/LAN IP conflict issue.
3. Fix HW NAT throughput issue
dir-850l-firmware-1.12
It is only for Hardware version A1.

Update D-Link DIR-850L router firmware to 1.10B08

This update is only applicable to North America devices.

The release notes for 1.10 are:

¤ Fix the issue with DS-Lite
¤ Fix the security issue with Samba
¤ Fix the issue with the mail server
¤ Fix the issue with DLNA
¤ Support the latest hidden page
¤ Support PPPoE Passthrough

I just don’t know what is latest hidden page.

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Upgrade DIR-850L firmware to v1.09

My DIR-850L has firmware 1.06 now.  Yesterday, I saw 1.09 is released in September, 2013.

I checked the release notes of it, below.

Firmware:   v1.09   9/17/2013 NA and EU Region
Revision Info:
¤ Block traffic between WAN and LAN ports during booting
¤ Fixed UPnP security issue
¤ Improved wireless IOT issue
¤ Enhanced direct access stability with mydlink SharePort app

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Got a D-Link DIR-850L to replace DIR-845L

Got DIR-850L at London Drugs. It is only $10 more than the one I got, DIR-845L at Costco. I did not see the benefits of SmartBeamTM Technology. So I spend $109 to get a new router with 802.11AC support. 802.11AC is a new standard. See new technologies data from Wiki.

  • Extended channel binding
    • Mandatory 80 MHz channel bandwidth for STAs (vs. 40 MHz maximum in 802.11n), 160 MHz available optionally
  • More MIMOspatial streams
    • Support for up to eight spatial streams (vs. four in 802.11n)
  • Multi-user MIMO(MU-MIMO)
    • Multiple STAs, each with one or more antennas, transmit or receive independent data streams simultaneously
      • “Space Division Multiple Access” (SDMA): streams not separated by frequency, but instead resolved spatially, analogous to 11n-style MIMO
    • Downlink MU-MIMO (one transmitting device, multiple receiving devices) included as an optional mode
  • Modulation
    • 256-QAM, rate 3/4 and 5/6, added as optional modes (vs. 64-QAM, rate 5/6 maximum in 802.11n)
    • Controversy has been raised that this modulation rate is not suitable for any architecture other than extremely small cells and would be completely useless to 3GPP
  • Other elements/features
    • Beamforming with standardized sounding and feedback for compatibility between vendors (non-standard in 802.11n made it hard for beamforming to work effectively between different vendor products)
    • MAC modifications (mostly to support above changes)
    • Coexistence mechanisms for 20/40/80/160 MHz channels, 11ac and 11a/n devices

dir850l-box

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