Posted: Wed Jun 21, 2017 3:20 Post subject: Netgear R6400 - Can't access admin page
I've had this Netgear R6400 for 5 months. The other day I had to power cycle the surge protector it was plugged into. Upon reboot, I no longer had 5GHz radio broadcasting (channel had unrecognizable characters) and LAN3 was lit white with nothing plugged in. Netgear wants $90 for 6 months of phone support to diagnose... I tried multiple versions of Netgear firmware with no luck.
At this point, I reset back to stock settings via the reset button and I tried installing dd-wrt.K3_R6400.chk from here: http://www.desipro.de/ddwrt/K3-AC-Arm/. I've run dd-wrt and tomato on older n-wireless routers, but this is my first go at broadcom. The install apparently did not finish/corrupted as I am no longer able to access the admin page.
Symptoms:
Amber power light, LAN1 white (wired to desktop), LAN3 white. The wireless light shows white after about 45sec. It seems to be power cycling (rebooting) about every minute.
What I've tried:
I've set a static IP on my desktop. Occasionally it will communicate and the Local Area Connection shows up as my old 5GHz wireless name, and the dd-wrt logo shows in the browser tab, but never loads.
I've ran Netgear's tftp2.exe using the default password and my old password trying to reload the Netgear firmware and also have tried the dd-wrt firmware with no luck.
When I can ping the router I get a TTL=100.
I've also tried cmd reflash via tftp -i 192.168.1.1 put dd-wrt.K3_R6400.chk, with no luck.
Posted: Wed Jun 21, 2017 8:25 Post subject: Re: Netgear R6400 - Can't access admin page
yz250f wrote:
I've had this Netgear R6400 for 5 months. The other day I had to power cycle the surge protector it was plugged into. Upon reboot, I no longer had 5GHz radio broadcasting (channel had unrecognizable characters) and LAN3 was lit white with nothing plugged in. Netgear wants $90 for 6 months of phone support to diagnose... I tried multiple versions of Netgear firmware with no luck.
At this point, I reset back to stock settings via the reset button and I tried installing dd-wrt.K3_R6400.chk from here: http://www.desipro.de/ddwrt/K3-AC-Arm/. I've run dd-wrt and tomato on older n-wireless routers, but this is my first go at broadcom. The install apparently did not finish/corrupted as I am no longer able to access the admin page.
Symptoms:
Amber power light, LAN1 white (wired to desktop), LAN3 white. The wireless light shows white after about 45sec. It seems to be power cycling (rebooting) about every minute.
What I've tried:
I've set a static IP on my desktop. Occasionally it will communicate and the Local Area Connection shows up as my old 5GHz wireless name, and the dd-wrt logo shows in the browser tab, but never loads.
I've ran Netgear's tftp2.exe using the default password and my old password trying to reload the Netgear firmware and also have tried the dd-wrt firmware with no luck.
When I can ping the router I get a TTL=100.
I've also tried cmd reflash via tftp -i 192.168.1.1 put dd-wrt.K3_R6400.chk, with no luck.
Any guidance here?
For me it's quite clear that it's a hardware issue on the router after you power cycled your protector. Although it's a bit weird that it's so weak that it got screwed by that. _________________ R6400v2 (boardID:30) - Kong 36480 running since 03/09/18 - (AP - DNSMasq - AdBlocking - QoS) R7800 - BS 31924 running since 05/26/17 - (AP - OpenVPN Client - DNSMasq - AdBlocking - QoS) R7000 - BS 30771 running since 12/16/16 - (AP - NAS - FTP - SMB - OpenVPN Server - Transmission - DDNS - DNSMasq - AdBlocking - QoS) R6250 - BS 29193 running since 03/20/16 - (AP - NAS - FTP - SMB - DNSMasq - AdBlocking)
I don't have a machine with serial ports anymore. I've seen posts about usb-ttl adapters. Will this accomplish the same thing?
It looks like there are a lot of these out there that don't work. Any suggestions on what to get/where so I don't have to try multiple cables?
Once I get this, are there any guides on what I need to do? This will be new to me.
Thanks for the replies. I'm betting on a hardware issue as well. Very frustrating that Netgear has a 1 year hardware warranty, but it requires a $90 (minimum) software support for them to diagnose.
Corrupt nvram, stop at the CFE prompt via CTRL+C and run command "nvram erase" (Note: in cfe you clear nvram via nvram erase in dd-wrt you have erase nvram which formats a partition) _________________ KONG PB's: http://www.desipro.de/ddwrt/
KONG Info: http://tips.desipro.de/
Ground is 2. I just worked on one last night. That's why you can't stop the cfe. It's not receiving your command. _________________ I am far from a guru, I'm barely a novice.
Last edited by Malachi on Sat Jun 24, 2017 11:20; edited 1 time in total
I had the correct settings in Putty for baud rate and COM port. I tried the pinout you suggested, but did not receive anything. A few other pinouts return responses like this:
Either way, windows no longer recognizes my CP2102 adapter, even after driver reinstalls and on other windows computers so I think it's messed up from trying the different pinouts. Probably going to kick the bucket and buy a new (non-Netgear) router.
Any suggestions for a router in the ~$100-150 range?
You probably plugged the ground wire into vcc. You should have gotten one like I posted in the link I gave you.
Get an r7000, r7500v2 or r7800 or if you want I've got an assumed rt-ac1900 converted to an rt-ac68p running kongs latest for sale in the sale section for a lot less than $100-150.
Same specs as an r7000, I've hard feed the cfe to run at 1.2ghz. Same temp as it had on 1ghz _________________ I am far from a guru, I'm barely a novice.