Netgear r6400 reverting back to stock firmware issue

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McG800
DD-WRT Novice


Joined: 19 Jan 2022
Posts: 2
PostPosted: Wed Jan 19, 2022 13:15    Post subject: Netgear r6400 reverting back to stock firmware issue Reply with quote
Hello everyone

I'm doing some speed testing testing with my router. I've been using DD-WRT for a few years now without issue. But I'm looking to flash my Netgear r6400 back to it's original firmware. I downloaded the firmware from Netgear and proceeded to use the flash function in DD-WRT. The router reboots, but it always comes back to the DD-WRT firmware. I reset to factory settings when doing the upgrade and also did the 30/30/30 reset. No luck. I then tired updating from the command line and I get this error:

[flash] : Netgear chk format detected
[flash] : Image too big for partition: linux
linux: Invalid argument

Any ideas how to get past this?
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kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 12406
Location: Texas, USA
PostPosted: Wed Jan 19, 2022 14:57    Post subject: Reply with quote
TFTP or nmrpflash.

https://kb.netgear.com/000059633/How-to-upload-firmware-to-a-NETGEAR-router-using-TFTP-client

https://kb.netgear.com/000059634/How-to-upload-firmware-to-a-NETGEAR-router-using-Windows-TFTP

https://kb.netgear.com/19841/Reinstall-the-firmware-on-a-router-without-the-setup-CD-recovery-tool

https://github.com/jclehner/nmrpflash
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McG800
DD-WRT Novice


Joined: 19 Jan 2022
Posts: 2
PostPosted: Wed Jan 19, 2022 17:11    Post subject: Reply with quote
I didn't even think about using the bricked method. I was able to flash the stock firmware using nmrpflash successfully.

And just as an FYI to anyone else: The stock firmware on the r6400 got me 400Mbps on my 1Gbps connection. DD-WRT with CTF and FA got me 700Mbps.

From what I understand the r6400 is very under powered. Looks like I'll be getting a new router soon.

Thank you!!
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