[SOLVED] R7000P boot loop after erase nvram && reboo

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ndsinister
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Joined: 17 Feb 2019
Posts: 4

PostPosted: Sun Feb 17, 2019 14:18    Post subject: [SOLVED] R7000P boot loop after erase nvram && reboo Reply with quote
Hi,

I own a Netgear Nighthawk R7000P that had Kong's dd-wrt firmware from May 2018. Today I decided to update it to the latest so I downloaded dd-wrt.v24-K3_AC_ARM_R7000P.bin and installed it via the web gui.

Installation was successful but my 5Ghz wifi wasn't working. I followed a post from this forum where sombody recommended to execute `erase nvram && reboot`. Unfortunately I missed the part that said `from command line` (which apparently had a hidden meaning `from telnet/ssh ONLY`) and I executed it from the web gui.

Since then my router is stuck in a boot loop.
I'm able to get ping result but for a few seconds. Here's a snippet:

ping: sendto: No route to host
Request timeout for icmp_seq 1876
ping: sendto: No route to host
Request timeout for icmp_seq 1877
ping: sendto: No route to host
Request timeout for icmp_seq 1878
ping: sendto: No route to host
Request timeout for icmp_seq 1879
ping: sendto: No route to host
Request timeout for icmp_seq 1880
Request timeout for icmp_seq 1881
64 bytes from 192.168.1.1: icmp_seq=1882 ttl=100 time=0.926 ms
64 bytes from 192.168.1.1: icmp_seq=1883 ttl=100 time=1.153 ms
64 bytes from 192.168.1.1: icmp_seq=1884 ttl=100 time=0.691 ms
64 bytes from 192.168.1.1: icmp_seq=1885 ttl=100 time=0.718 ms
64 bytes from 192.168.1.1: icmp_seq=1886 ttl=100 time=0.610 ms
64 bytes from 192.168.1.1: icmp_seq=1887 ttl=100 time=0.756 ms
64 bytes from 192.168.1.1: icmp_seq=1888 ttl=100 time=0.562 ms
64 bytes from 192.168.1.1: icmp_seq=1889 ttl=100 time=0.555 ms
64 bytes from 192.168.1.1: icmp_seq=1890 ttl=100 time=0.536 ms
64 bytes from 192.168.1.1: icmp_seq=1891 ttl=100 time=0.780 ms
64 bytes from 192.168.1.1: icmp_seq=1892 ttl=100 time=0.552 ms
64 bytes from 192.168.1.1: icmp_seq=1893 ttl=100 time=0.758 ms
64 bytes from 192.168.1.1: icmp_seq=1894 ttl=100 time=0.769 ms
64 bytes from 192.168.1.1: icmp_seq=1895 ttl=100 time=0.747 ms
Request timeout for icmp_seq 1896
Request timeout for icmp_seq 1897
Request timeout for icmp_seq 1898
Request timeout for icmp_seq 1899
Request timeout for icmp_seq 1900
Request timeout for icmp_seq 1901
Request timeout for icmp_seq 1902
Request timeout for icmp_seq 1903
Request timeout for icmp_seq 1904
Request timeout for icmp_seq 1905
Request timeout for icmp_seq 1906
Request timeout for icmp_seq 1907
Request timeout for icmp_seq 1908

I followed the post of troubleshooting bricked router and was relieved to read that it may not be bricked due to ping response ttl 100. I tried to upload the firmware following the tftp guide for macos with the following commands pasted to tftp console while ping is successful:

connect 192.168.1.1
binary
rexmt 1
timeout 60
put dd-wrt.v24-K3_AC_ARM_R7000P.bin

but all I get (after 60 seconds) is "unreachable"
I tried a few times in different time windows and it shows the same error all the time.

When the router boots up, the power led is solid orange (no blinking) then a fter a few seconds the rightmost led lights up solid white (no blinking) and after a few seconds it turns off. Then few more seconds later and the power led goes off and right after that all the leds light up except the 2 rightmost ones for a couple of seconds and then the whole thing repeats.

I tried hard reset (WPS button) by following the instructions here: https://wiki.dd-wrt.com/wiki/index.php/Hard_reset_or_30/30/30#Hard_Reset_on_ARM_and_other_newer_routers but that didn't do anything. The power led didn't blink as written in the instructions...

I'd be glad for any help I can get.
(no jtag nor serial at my disposal)


Last edited by ndsinister on Sun Feb 17, 2019 15:44; edited 1 time in total
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ndsinister
DD-WRT Novice


Joined: 17 Feb 2019
Posts: 4

PostPosted: Sun Feb 17, 2019 15:43    Post subject: Reply with quote
OK. Finally managed to recover it after hours and hours of tries and googling the net.

Following https://forum.dd-wrt.com/phpBB2/download.php?id=42046
instructions and specifically NMRPFLASH tool saved my router.
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5360
Location: Akershus, Norway

PostPosted: Sun Feb 17, 2019 17:30    Post subject: Reply with quote
This topic belongs in the Broadcom forum.
Dr_K
DD-WRT User


Joined: 23 Mar 2018
Posts: 442

PostPosted: Mon Feb 18, 2019 13:28    Post subject: Reply with quote
Congratulations on finding a fix for your situation on your own....especially on the same day you asked for help...?

That is usually the best way...that'll stick in your head for issues down the road


Though maybe next time do a little more reading before blindly running commands...

Not only as you later figured out that you should not run them through the webif/gui...

Also that command you ran, when followed by a reboot....will now write back most of the nvram variables from ram before the reboot...

Aparently in your router's case...not enough of them to successfully boot back up

The current command (from at least 04/18 ) is now "nvram erase"...

Good luck moving forward

_________________
Location 1
R6300V2- DD-WRT v3.0-r39345M kongac (04-03-19) Gateway
WNDR3400v1 DD-WRT.v3.0-r35531_mega-nv64k (03/26/18 ) Access Point
WRT160Nv3 DD-WRT ?v3?.0-r35531 mini (03/26/18 ) Access Point
WRT54GSv5 DD-WRT v24-r33555_micro_generic (10/20/17) Repeater
Location 2
R6300V2- DD-WRT v3.0-r39345M kongac (04/03/19) Gateway
R6300V2- DD-WRT v3.0-r39345M kongac (04/03/19) Access Point
WNDR3700v2 DD-WRT v3.0-r35531 std (03/26/18 ) Access Point
E1200 v2 DD-WRT v3.0-r35531 mega-nv64k (03/26/18 ) Gateway(for trivial reasons)
2 devices: SXT 5 ac (mipsbe) RB 6.46.2 (1/14/20) PTP Bridge (0.8km/0.5mi)tx/rx866.6Mbps-1GbpsLAN


Thank You BrainSlayer & <Kong> for ALL that you do & have done, also to "most" everyone here that shares their knowledge
jtcsilva
DD-WRT Novice


Joined: 09 Feb 2020
Posts: 1

PostPosted: Sun Feb 09, 2020 14:56    Post subject: Reply with quote
ndsinister wrote:
OK. Finally managed to recover it after hours and hours of tries and googling the net.

Following https://forum.dd-wrt.com/phpBB2/download.php?id=42046
instructions and specifically NMRPFLASH tool saved my router.


My router was exactly with the problem you described after a failed firmware update attempt.
Flashing the Router using nmrpflash solved the problem.
Thank you very much for sharing this wonderful guide.
tinkeruntilitworks
DD-WRT User


Joined: 21 May 2019
Posts: 179

PostPosted: Mon Feb 10, 2020 20:48    Post subject: Reply with quote
thanks for bumping this

i bricked mine a while back and tried a few different methods and was unsuccessful.

this did the trick
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