WR840N

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jsteng
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Joined: 10 Jun 2009
Posts: 46

PostPosted: Mon Sep 26, 2011 16:41    Post subject: WR840N Reply with quote
I bought WR840N when I was in China this May because their Hotels do not have WIFI Access and I was unlucky to had only an iPAD instead of laptop when I was there.

Now, I want to flash DD-WRT onto this WR840N wifi router. This WR840N is hardware compatible with WR841N which DD-WRT is supported.

Directly, WR840N does not accept non-WR840N firmware. Many Chinese would use a "hack serial cable" to force TFTP the firmware; or modify WR841N firmware by masking it with WR840N firmware headers then flashing it; before flashing DD-WRT.

I have no clue/idea on how to mask WR841N firmware acceptable for a WR840N. Any ideas?

Thanks!
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LOM
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Joined: 28 Dec 2008
Posts: 7632

PostPosted: Mon Sep 26, 2011 17:44    Post subject: Re: WR840N Reply with quote
jsteng wrote:
This WR840N is hardware compatible with WR841N which DD-WRT is supported.



Compatible with which version of the WR841N?
The 841N is available in 2 different Atheros platforms.

I can fix the header for you so the dd-wrt firmware works on the 840N but you'll have to tell me which 841 version I should do the fix on.

Your WR840N must be of hardware version 1.x, version 2.x has only 2MB flash and can not run dd-wrt.

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jsteng
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Joined: 10 Jun 2009
Posts: 46

PostPosted: Tue Sep 27, 2011 16:32    Post subject: Reply with quote
I have WR840N v1.1. According to some chinese forum it is hardware compatible with WR841N v7.


Here is link at openWRT describing WR840N chipset vs WR841N v7:
https://forum.openwrt.org/viewtopic.php?pid=119847#p119847
(The original post in chinese http://www.right.com.cn/forum/thread-41697-1-1.html
"...Summarize, WR840N the basic configuration is the ATHEROS AR7241 + AR9287, 32MB RAM, 4MB FLASH. I have not used the 841N, do not know how to heat it on my own trial 840N situation, the heat is really low. I am not aware of these chips, such as the AR7241 AR7240 than what improvements, AR9287, what features, please let me know friends or tell me where to find information on these chips.")


Installing OpenWRT onto WR840N via tftp (using serial?)
https://forum.openwrt.org/viewtopic.php?pid=120217#p120217


Here is link to a chinese sailor's attempt at flashing DD-WRT onto his WR840N: http://www.anywlan.com/bbs/thread-93185-1-1.html


I hope this helps!
jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Wed Sep 28, 2011 12:28    Post subject: Reply with quote
Now testing DD-WRT v24-sp2 (04/13/11) std - build 16785 (firmware based on WR841N v7) on WR840N v1.1 .

Flashed without any problem.

Default WR840N firmware crashes within 48hrs. Must be leaky memory management or something screwy within. Now with DD-WRT firmware, will post updates (bugs, stability, etc) on how this is doing.

So far so good. Sweet!
LOM
DD-WRT Guru


Joined: 28 Dec 2008
Posts: 7632

PostPosted: Wed Sep 28, 2011 13:33    Post subject: Reply with quote
I have opened a ticket requesting official support for it

http://svn.dd-wrt.com:8000/ticket/2209

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jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Wed Sep 28, 2011 23:33    Post subject: Reply with quote
Here is a screenshot of WR840N v1.1 running on DD-WRT.

Its been running since it was flashed circa 12PM GMT Sep 28, 2011.
jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Thu Sep 29, 2011 16:48    Post subject: Reply with quote
29 hours later and running without glitch...

Im using basic settings only with connection watchdog.
jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Sat Oct 01, 2011 15:18    Post subject: Reply with quote
3 days, no problem. its running stable with 4 machines connected.

gotta love DDWRT!
LOM
DD-WRT Guru


Joined: 28 Dec 2008
Posts: 7632

PostPosted: Mon Oct 03, 2011 11:00    Post subject: Reply with quote
Thanks for the feedback!
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jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Tue Oct 04, 2011 4:16    Post subject: Reply with quote
After 6 days, still running without rebooting (ie, no problem).
jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Wed Oct 12, 2011 6:12    Post subject: Reply with quote
Its been running non-stop except for some power outages.

So far so good.
BrainSlayer
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Joined: 06 Jun 2006
Posts: 6913
Location: Dresden, Germany

PostPosted: Sun Oct 16, 2011 14:30    Post subject: Reply with quote
support now integrated
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Linux DD-WRT 4.14.8 #42 SMP PREEMPT Thu Dec 21 18:11:16 CET 2017 armv7l DD-WRT
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jsteng
DD-WRT Novice


Joined: 10 Jun 2009
Posts: 46

PostPosted: Sun Oct 16, 2011 16:55    Post subject: Reply with quote
About 90 minutes ago, the router mysteriously became "invisible" to my wireless devices; none could find the SSID and could not connect. I am not aware when was the exact time this occured today as I was away from home the whole day today. I had to restart the router to recover.

This occurs regularly (within 48hrs) when it was running on native firmware. It now occured for the very first time running on DD-WRT.

The router was configured with WDS/Connection Watchdog checking on IP Address "8.8.8.8" every 300seconds. I was hoping that should prevent it from loosing connection. Now I added to scheduled reboot itself @ 4:00AM everyday to prevent any crashes due to memory leak.
cyberde
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Joined: 07 Jun 2006
Posts: 1488
Location: the Netherlands

PostPosted: Wed Oct 26, 2011 15:19    Post subject: Reply with quote
Any download link for the firmare? I have one now in China and the stock firmware really blows hehe.

Which one do we need, the k26 or the k24?

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LOM
DD-WRT Guru


Joined: 28 Dec 2008
Posts: 7632

PostPosted: Wed Oct 26, 2011 16:33    Post subject: Reply with quote
While waiting for an official build from Brainslayer, here is the file jsteng tested
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