Netgear R6400 - Can't access admin page

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yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Wed Jun 21, 2017 3:20    Post subject: Netgear R6400 - Can't access admin page Reply with quote
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?
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Xeon2k8
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Joined: 11 Feb 2016
Posts: 1288

PostPosted: Wed Jun 21, 2017 8:25    Post subject: Re: Netgear R6400 - Can't access admin page Reply with quote
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)
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Wed Jun 21, 2017 9:32    Post subject: Reply with quote
You'll need to put serial cable on it to see what's going on.
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yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Wed Jun 21, 2017 11:13    Post subject: Reply with quote
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.
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Wed Jun 21, 2017 11:39    Post subject: Reply with quote
Google dd-wrt serial recovery. I have a link in there for the adapter.
Pm sent.

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hubermania
DD-WRT User


Joined: 24 Aug 2012
Posts: 223

PostPosted: Wed Jun 21, 2017 13:52    Post subject: Reply with quote
yz250f wrote:
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?


The Sabrent CB-DB9P USB-to-serial cable has a Prolific chip that is widely supported. I paired it with a USB OTG adapter to access a UPS from my Android phone, feeling quite proud of my accomplishment! Laughing

_________________
[Broadcom] Asus rt-ac66u r35531 ('66 should only be factory reset through the DD UI)
Fix RT-AC66U "wl1 [2.4 GHz TurboQAM]". DD-WRT failsafe UI @ http|https://169.254.255.1/
yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Wed Jun 21, 2017 17:13    Post subject: Reply with quote
Thanks for the suggestions. I'll get a USB TTL adapter with the CP2102 chip on order.
yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Thu Jun 22, 2017 2:38    Post subject: Reply with quote
Good news - I won't have to solder any header pins onto the board for serial communications.

Bad news - I can't find the pinout. Rolling Eyes

Can anybody verify/suggest a pinout for Rx, Tx, Gnd, and Vs/3.3V?

There is a number 2 on one pin so I would assume left to right pin numbering as in this picture.

I did find the pinout for R6300v2. How bad of an assumption would it be to think they are the same??
https://wikidevi.com/wiki/Netgear_R6300_v2

One other thing - what voltage should I be seeing from my USB ttl converter? 3.3V? I can verify this before connect to the router if I have a value.



Picture2.jpg
 Description:
Netgear R6400 AC1750 J252
 Filesize:  26.45 KB
 Viewed:  13526 Time(s)

Picture2.jpg


yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Sat Jun 24, 2017 3:15    Post subject: Reply with quote
I got it to communicate. My adapter was 5V, but didn't need to connect it. The pinout is not the same as R6300.

Pinout for R6400 is:
1 - Vcc (3.3V, do not connect)
2 - Tx
3 - Rx
4 - Ground

This is the log file. It looks like I am missing the Ctrl-C command as it starts the load sequence. I am using a wireless USB keyboard...

Any help?

A few lines that stand out to me:

Loader:raw Filesys:tftp Dev:eth0 File:192.168.1.2:vmlinuz Options:(null)
Loading: Failed.
Could not load 192.168.1.2:vmlinuz: Timeout occured
Checking crc...Loader:raw Filesys:raw Dev:nflash0.os File: Options:(null)

found nand nvram at 80000

Scanning device for bad blocks
Bad eraseblock 264 at 0x000002100000

cannot open /dev/nvram
udevtrigger[358]: parse_config_file: can't open '/etc/udev/udev.conf' as config file: No such file or directory

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = 8705c000
[00000000] *pgd=0726e831, *pte=00000000, *ppte=00000000
Internal error: Oops - BUG: 17 [#1] SMP ARM
Modules linked in: wl(P+) igs(P) emf(P) switch_robo switch_core et(P)
CPU: 1 PID: 596 Comm: insmod Tainted: P 4.4.70 #340



-20170623-220836.txt
 Description:
PuTTY Log

Download
 Filename:  -20170623-220836.txt
 Filesize:  30.44 KB
 Downloaded:  492 Time(s)

<Kong>
DD-WRT Guru


Joined: 15 Dec 2010
Posts: 4339
Location: Germany

PostPosted: Sat Jun 24, 2017 7:36    Post subject: Reply with quote
yz250f wrote:
I got it to communicate. My adapter was 5V, but didn't need to connect it. The pinout is not the same as R6300.

Pinout for R6400 is:
1 - Vcc (3.3V, do not connect)
2 - Tx
3 - Rx
4 - Ground

This is the log file. It looks like I am missing the Ctrl-C command as it starts the load sequence. I am using a wireless USB keyboard...

Any help?

A few lines that stand out to me:

Loader:raw Filesys:tftp Dev:eth0 File:192.168.1.2:vmlinuz Options:(null)
Loading: Failed.
Could not load 192.168.1.2:vmlinuz: Timeout occured
Checking crc...Loader:raw Filesys:raw Dev:nflash0.os File: Options:(null)

found nand nvram at 80000

Scanning device for bad blocks
Bad eraseblock 264 at 0x000002100000

cannot open /dev/nvram
udevtrigger[358]: parse_config_file: can't open '/etc/udev/udev.conf' as config file: No such file or directory

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = 8705c000
[00000000] *pgd=0726e831, *pte=00000000, *ppte=00000000
Internal error: Oops - BUG: 17 [#1] SMP ARM
Modules linked in: wl(P+) igs(P) emf(P) switch_robo switch_core et(P)
CPU: 1 PID: 596 Comm: insmod Tainted: P 4.4.70 #340


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)

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Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Sat Jun 24, 2017 9:44    Post subject: Reply with quote
yz250f wrote:
I got it to communicate. My adapter was 5V, but didn't need to connect it. The pinout is not the same as R6300.

Pinout for R6400 is:
1 - Vcc (3.3V, do not connect)
2 - Tx
3 - Rx
4 - Ground

This is the log file. It looks like I am missing the Ctrl-C command as it starts the load sequence. I am using a wireless USB keyboard...

Any help?

A few lines that stand out to me:

Loader:raw Filesys:tftp Dev:eth0 File:192.168.1.2:vmlinuz Options:(null)
Loading: Failed.
Could not load 192.168.1.2:vmlinuz: Timeout occured
Checking crc...Loader:raw Filesys:raw Dev:nflash0.os File: Options:(null)

found nand nvram at 80000

Scanning device for bad blocks
Bad eraseblock 264 at 0x000002100000

cannot open /dev/nvram
udevtrigger[358]: parse_config_file: can't open '/etc/udev/udev.conf' as config file: No such file or directory

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = 8705c000
[00000000] *pgd=0726e831, *pte=00000000, *ppte=00000000
Internal error: Oops - BUG: 17 [#1] SMP ARM
Modules linked in: wl(P+) igs(P) emf(P) switch_robo switch_core et(P)
CPU: 1 PID: 596 Comm: insmod Tainted: P 4.4.70 #340


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.

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Last edited by Malachi on Sat Jun 24, 2017 11:20; edited 1 time in total
yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Sat Jun 24, 2017 11:10    Post subject: Reply with quote
If ground is 2, what are the tx and rx pins? 3 and 4, respectively?

I tried that and couldn't get a reply. I received a bunch of blank characters, ~30 out them, with a handful of legible letters?


I'll try flipping ground and tx.
nihilt_
DD-WRT Novice


Joined: 25 Jun 2017
Posts: 6

PostPosted: Sun Jun 25, 2017 13:49    Post subject: Reply with quote


Set serial speed 115200, both device manager (COMx) & putty.
yz250f
DD-WRT Novice


Joined: 21 Jun 2017
Posts: 10

PostPosted: Sun Jun 25, 2017 23:08    Post subject: Reply with quote
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:

!  € ˆBJJJUï  ˆ„DJJUk% € „”Jj­­   ˆBJJJ¥ý €ˆ DJ¥U­   ”JJUû%  ()))µ­ €”J[¥ÿ%    ˆBJJJ­ý €„"ˆJ*UUÿ ˆ))©Õÿ ˆˆˆJJªë÷E ˆˆˆJJªÕÿ! €  ˆJJJJ¥í €ˆ¢©ªµ­ý € (ˆJJJ­ý  € „ ”Jk­­ý% ””Jª«ý   ˆ))«¥ €„¢UUU­  € D())µ­ ‰"”Jj­­ ˆB))­­­ € ˆB))©­ß ( ”JªU­ÿ  (DB”JZ½ÿ DD”JjÕë% € DˆJJ«õ¿ €„))µ­ €ˆ‰B¢•UU×%   „ˆJJª­ „”Jªµ „„()©U­   ˆˆBJJJ¥ý €D"ˆ*ªU­ý   ˆBJJªÕ¿! ‰DˆJj­¥ý  ˆˆJJª­ß% € ˆˆB))iµ÷ €ˆBBBJJªµ÷%  € ˆ))«­ ((ˆJJ­­ÿ% ‰ˆJJJª¥ý  ˆB„))©­ý% €„ˆˆJªU­Ý € ˆBDBJJ­­ „"ˆJ*UU÷%  ”ˆ))mkw!  ˆ„JJJ¥­% €€(ˆˆJªU­ÿ € „DJJJª­ €ˆDˆJªU­ÿ!  DD)))U­  (D”JJ­ý ˆˆBJ*¥U­  € ˆDBJJª­ÿ% „"ˆJJUUß  ˆB„()iµý € ˆB"())«ý ˆˆJJUëÿ   ˆˆJJJª­ý ˆTªU­ý% DD¢))µ­  ˆˆˆJJªÕ÷%  D))©Õ!   ‰(DJJJ¥ý

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?
Malachi
DD-WRT Guru


Joined: 17 Jul 2012
Posts: 7209
Location: Columbus, Ohio

PostPosted: Sun Jun 25, 2017 23:15    Post subject: Reply with quote
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

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