R7000: 2.4Ghz Wifi Broken Maybe After Upgrade?

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TCB13
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Joined: 06 Jun 2010
Posts: 260
Location: Portugal

PostPosted: Thu Sep 16, 2021 16:49    Post subject: R7000: 2.4Ghz Wifi Broken Maybe After Upgrade? Reply with quote
Hello,

I own a Netgear R7000 and I recently upgraded from r44191 to r47135 without resetting settings (my mistake) and here is what happened:

It didn't restart/upgrade properly (flashing power LED for an hour) and a manual power off/on left it in some inconsistent state rebooting by itself. Recovery mode / tftp wasn't working on the first seconds of boot.

A push the reset button made it boot with default settings, however:

1) 2.4Ghz LED never turned on again;
2) The network appears on my phone/laptop but the devices say they can't connect to the network.

Installed the Netgear firmware and the LED was still off. Flashed again with factory-to-dd-wrt and then to the std version with resets. Same behaviors. Also tired to upgrade to r47381 without luck.

As you guys know on those R7000 during boot all LEDs flash for a second, in this unit the 2.4Ghz doesn't flash anymore.

Is there anything related to software that can break and survive a flash with the Netgear firmware? Or was this just bad coincidence and my 2.4Ghz just fried?

Here is the dmesg output: https://cdn.iklive.eu/tcb13/2021/r7000-broken-wifi-dmesg.txt

Thank you.

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Alozaros
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Joined: 16 Nov 2015
Posts: 6408
Location: UK, London, just across the river..

PostPosted: Thu Sep 16, 2021 17:21    Post subject: Reply with quote
if i remember correctly, something similar happened on me once, back in the days...after an upgrade 2,4Ghz wi-fi was missing so i had to look around and was advised to have a read here and there...
so the only option i ve found was to use CLI flash

if you have internet, connect to the router via LAN ports, than log in via ssh and try to issue those 3 commands:

cd /tmp

wget ftp://ftp.dd-wrt.com/betas/2021/09-08-2021-r47381/netgear-r7000/netgear-r7000-webflash.bin

mtd -r write netgear-r7000-webflash.bin linux

now you have to wait (w) until flash is done, don't be worried if any message occurs, as long the flash is going on
--------------------------------------------------
if no connection is available than you'd need WinSCP

On WinSCP:
1 Select New Site;
2 File protocol: SCP;
3 Hostname: 192.168.1.1 (or your router IP);
4 Username: root
5 Password: your admin pass
6 Drag downloaded firmware from Download folder and drop in /tmp

On putty;
1 Login on 192.168.1.1 (user root and pass);
2 Type:
cd /tmp (Enter)
mtd -r write netgear-r7000-webflash.bin linux

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TP-Link WR740Nv1 ---DD-WRT 55179 WAP
TP-Link WR1043NDv2 -DD-WRT 55303 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
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Netgear XR500 --DD-WRT 55460 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55460 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55363 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
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Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
------------------------------------------------------
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12835
Location: Netherlands

PostPosted: Fri Sep 17, 2021 12:31    Post subject: Reply with quote
Check your power supply or try another power supply.

It sound strange but I have seen strange things when the power supply is failing

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TCB13
DD-WRT User


Joined: 06 Jun 2010
Posts: 260
Location: Portugal

PostPosted: Tue Sep 21, 2021 20:13    Post subject: Reply with quote
Alozaros wrote:
if i remember correctly, something similar happened on me once, back in the days...after an upgrade 2,4Ghz wi-fi was missing so i had to look around and was advised to have a read here and there...
so the only option i ve found was to use CLI flash

if you have internet, connect to the router via LAN ports, than log in via ssh and try to issue those 3 commands:

cd /tmp

wget ftp://ftp.dd-wrt.com/betas/2021/09-08-2021-r47381/netgear-r7000/netgear-r7000-webflash.bin

mtd -r write netgear-r7000-webflash.bin linux

now you have to wait (w) until flash is done, don't be worried if any message occurs, as long the flash is going on
--------------------------------------------------
if no connection is available than you'd need WinSCP

On WinSCP:
1 Select New Site;
2 File protocol: SCP;
3 Hostname: 192.168.1.1 (or your router IP);
4 Username: root
5 Password: your admin pass
6 Drag downloaded firmware from Download folder and drop in /tmp

On putty;
1 Login on 192.168.1.1 (user root and pass);
2 Type:
cd /tmp (Enter)
mtd -r write netgear-r7000-webflash.bin linux


I did this upgrade, same thing. I even tried to procedure and upgraded to DD-WRT v3.0-r47474 std (09/20/21) with the same results.

egc wrote:
Check your power supply or try another power supply.

It sound strange but I have seen strange things when the power supply is failing


It took me a while (as you might have noticed) but I got a new power supply, unfortunately I'm still having this issue.

I guess my 2.4Ghz radio is fried at this point, it says its ON but it doesn't work.


_________________
1x Netgear R7800 (latest); 3x Netgear R7000 (latest); 2x Asus RT-N16 (v3.0-r47656); 2x Fonera 2100 (v3.0-r45454).
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Tue Sep 21, 2021 20:27    Post subject: Reply with quote
Initially not resetting was not necessarily a mistake; flashing via cli was likely NOT a solution; you could try to go in via ssh and issue an 'nvram erase && reboot' and reconfigure from scratch. If at that point, you have no 2.4 prior to doing any configurations, then it's toast or there is something broken in the firmware image. Only way to know for sure is with logs.
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TCB13
DD-WRT User


Joined: 06 Jun 2010
Posts: 260
Location: Portugal

PostPosted: Wed Sep 22, 2021 11:19    Post subject: Reply with quote
kernel-panic69 wrote:
you could try to go in via ssh and issue an 'nvram erase && reboot' and reconfigure from scratch.


Is there any difference between the GUI options that says "reset to factory settings" and issuing 'nvram erase && reboot'? I tried that option multiple times even with the stock firmware with no luck. And before I reconfigured from scratch 2.4 wasn't working.

kernel-panic69 wrote:
Only way to know for sure is with logs.


What logs specifically? I've provided the dmesg in the fist post.

Thank you.

_________________
1x Netgear R7800 (latest); 3x Netgear R7000 (latest); 2x Asus RT-N16 (v3.0-r47656); 2x Fonera 2100 (v3.0-r45454).
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 14125
Location: Texas, USA

PostPosted: Wed Sep 22, 2021 13:08    Post subject: Reply with quote
Serial console log would probably be ideal; but I think you can use 'nvram set console_debug=1' and 'nvram set service_debug=1' and it will be in the syslog. Not sure if the latter applies to anything but x86 images, YMMV.
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