Bricked Archer C7 V2 US

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v0idst4r
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Joined: 19 May 2018
Posts: 5

PostPosted: Sat May 19, 2018 17:56    Post subject: Bricked Archer C7 V2 US Reply with quote
No surprise here, I bricked my router while upgrading remotely over SSH and a mobile connection. I tried to do
Code:
mtd -r write <downloaded upgrade> fullflash
. The power light and the ethernet lights do come on but nothing else. I tried doing the TFTP unbrick but it never looks for x.x.x.66 at least looking at wireshark. I put factory-to-ddwrt-US.bin on a tftp server and renamed it to ArcherC7v2_tp_recovery.bin but it didn't appear to upgrade. I also tried ArcherC7v3_tp_recovery.bin. I did statically set the IP 192.168.0.66 and tried 192.168.1.66 too. No luck. Any help is appreciated.
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ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2318
Location: Canada

PostPosted: Sun May 20, 2018 2:54    Post subject: Serial Reply with quote
I, personally, have never had any luck debricking one of these without opening up the case. For me, it always requires TFTP and Serial. Note, you need something like this, for serial: https://www.adafruit.com/product/954

You can then interrupt the boot sequence and restart the TFTP client (on the router) when you are ready. You can also see the status of it.

I have used the instructions in the OpenWRT forum before, read this section and the one below it: https://openwrt.org/toh/tp-link/archer-c5-c7-wdr7500#tftp_recovery_de-bricking

_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
MomenMamdouh
DD-WRT User


Joined: 19 Sep 2017
Posts: 150
Location: Egypt

PostPosted: Sun May 20, 2018 8:45    Post subject: Reply with quote
be sure you are using a lan port not wan port
v0idst4r
DD-WRT Novice


Joined: 19 May 2018
Posts: 5

PostPosted: Sun May 20, 2018 13:41    Post subject: Re: Serial Reply with quote
ian5142 wrote:
I, personally, have never had any luck debricking one of these without opening up the case. For me, it always requires TFTP and Serial. Note, you need something like this, for serial: https://www.adafruit.com/product/954

You can then interrupt the boot sequence and restart the TFTP client (on the router) when you are ready. You can also see the status of it.

I have used the instructions in the OpenWRT forum before, read this section and the one below it: https://openwrt.org/toh/tp-link/archer-c5-c7-wdr7500#tftp_recovery_de-bricking

Can I use a Teensy ++ 2.0?

MomenMamdouh wrote:
be sure you are using a lan port not wan port

Yes I tried the first LAN port, is there one I should be using in particular?
ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2318
Location: Canada

PostPosted: Sun May 20, 2018 13:48    Post subject: Teensy ++ Reply with quote
Apparently yes: https://forum.pjrc.com/threads/27940-Teensy-as-USB-to-UART-converter

As for TFTP, make sure you set up a TFTP server on the computer, not a TFTP client. I use TFTP32/TFTP64.

I then use Putty or some other serial communications program (Bray's Terminal) to see what the router is doing. Baud and other serial settings should be listed on the openwrt page I linked to earlier.

_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
v0idst4r
DD-WRT Novice


Joined: 19 May 2018
Posts: 5

PostPosted: Sun May 20, 2018 14:01    Post subject: Re: Teensy ++ Reply with quote
ian5142 wrote:
Apparently yes: https://forum.pjrc.com/threads/27940-Teensy-as-USB-to-UART-converter

As for TFTP, make sure you set up a TFTP server on the computer, not a TFTP client. I use TFTP32/TFTP64.

I then use Putty or some other serial communications program (Bray's Terminal) to see what the router is doing. Baud and other serial settings should be listed on the openwrt page I linked to earlier.

Thanks, I'll give it a shot. Yeah I had a server running (tftp-hpa on arch linux). I also made sure it was accessible.
v0idst4r
DD-WRT Novice


Joined: 19 May 2018
Posts: 5

PostPosted: Sun May 20, 2018 18:46    Post subject: Re: Teensy ++ Reply with quote
ian5142 wrote:
Apparently yes: https://forum.pjrc.com/threads/27940-Teensy-as-USB-to-UART-converter

As for TFTP, make sure you set up a TFTP server on the computer, not a TFTP client. I use TFTP32/TFTP64.

I then use Putty or some other serial communications program (Bray's Terminal) to see what the router is doing. Baud and other serial settings should be listed on the openwrt page I linked to earlier.

Do I need to convert my Teensy to 3.3v?
ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2318
Location: Canada

PostPosted: Sun May 20, 2018 19:03    Post subject: Teensy ++ Reply with quote
I don't own a Teensy. Read the link I posted about it. Search elsewhere on the web. You should be able to find someone who used the Teensy as a USB-to-UART device. Just don't hook up the VCC (usually Red) wire to the router, it does not require it.
_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
v0idst4r
DD-WRT Novice


Joined: 19 May 2018
Posts: 5

PostPosted: Sun May 20, 2018 20:38    Post subject: Re: Teensy ++ Reply with quote
ian5142 wrote:
I don't own a Teensy. Read the link I posted about it. Search elsewhere on the web. You should be able to find someone who used the Teensy as a USB-to-UART device. Just don't hook up the VCC (usually Red) wire to the router, it does not require it.

Oh my bad, yeah in that case I wouldn't have to convert to 3.3v since the router will power it itself.
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