This is the latest info I found from Sept 16, 2016 - 

https://www.dd-wrt.com/wiki/index.php/Netgear_WNDR3400

Other links are older. However, ymmv as I did not probe that deeply into the dd-wrt web sites.

Mark

On Wed, Oct 18, 2017 at 6:45 PM, Stephen Partington <cryptworks@gmail.com> wrote:
It is weird. They support several of the  erosion of the 3400 except 4 I think. 

On Oct 18, 2017 6:02 PM, "Mark Phillips" <mark@phillipsmarketing.biz> wrote:
I looked for a DD_WRT version for the WNDR3400v3 router, and I did not find anything current. It seems the hardware is not supported yet?

Anyway, I did find a way to backup the configuration of the router. I performed the Netgear upgrade, and it seems to have saved all the configuration settings, but I used the back up anyway and all seems to be working!

Thanks!

Mark

On Wed, Oct 18, 2017 at 4:46 PM, Stephen Partington <cryptworks@gmail.com> wrote:
I have the same device and have installed DD-WRT on it right now. 

More to the point if you backup your settings in case of failure they should persist across updates. 

On Oct 18, 2017 3:54 PM, "Mark Phillips" <mark@phillipsmarketing.biz> wrote:
I find I need to upgrade the firmware on my Netgear WNDR3400v3 routers. I actually only use them as APs. Does anyone have experience with upgrading the firmware? Specifically, doe the routers retain all the settings, or are they set back to factory defaults? There is no way to download the settings that I can see, and the documentation says to write down all the settings before upgrading. 

Thanks!

Mark

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