Debrick/unbrick TP-Link Archer C7 AC1750 WiFi router using TFTP with serial console

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In this video we will debrick TP-Link AC1750 Wireless Dual Band Gigabit Router Archer C7 using TFTP server, however to undestand what is going on, we solder serial console interface to monitor its boot log.
The router was bricked by flashing wrong firmware version.
I got some feedback from clients that even OpenWrt is supported but sometime router still got brick flashing OpenWrt
If your router has this flahing pattern, you can follow this guide to unbrick/debrick it.
First step is to download Tp-Link C7 firmware, and find debrick guide from the Internet
My router is Archer C7 V2 so I will choose Download for Archer C7 V2 then Firmware
I will download Archer C7 V2 firmware to my PC
Then I will extract the firmware to a folder
Now we will learn how to debrick my C7 router
You can find it by search for tplink c7 debrick
Follow this guide we will change flash file name to ArcherC7v2_tp_recovery.bin and PC's IP to 192.168.0.66 (SubnetMask /24 = 255.255.255.0)
To activate TFTP Recovery press and hold WPS/Reset Button during powering on until WPS LED turns on
Now we will follow the guide change my flash file to ArcherC7v2_tp_recovery.bin
Then we will disable my wireless and change LAN IP to 192.168.0.66 /24
Now start TFTP server and make sure 192.168.0.66 is in server interfaces option
Browse Current Directory and point it to the folder you store flash file
We can choose Show Dir to check the file name
To activate TFTP Recovery I will press and hold WPS/Reset Button during powering on until WPS LED turns on
I solder serial console interface for my TP-Link Archer C7 AC1750 so we can see what is going on when we press and release the button
The router is boot up, set it own IP to 192.168.0.86 and downloading firmware file from 192.168.0.66 TFTP server
Flash chip is erasing before copying firmware
Now firmware is copying to flash chip
Now my router is reboot
Now we can access TP-Link Archer C7 AC1750 GUI Interface via 192.168.0.1
My router is working now
Thank you for watching. If your router is bricked, you can follow my guide or send to us to get it unbricked
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More information:
TP-Link Archer C7 AC1750 WiFi router
Dual Band (concurrent) and Gigabit Ethernet. Advertised as 1750 Mbps. It has simultaneous Triple-Stream (3x3) radios on both 2.4GHz and 5 GHz Bands. It supports 802.11n in 2.4GHz for 450Mbps throughput and IEEE 802.11ac (draft) for 1300Mbps throughput in 5GHz.

TFTP Recovery (De-Bricking)

The serial-less TFTP recovery method for the TP-Link TL-WDR4300 also works for the Archer C7 (confirmed on v1.1 and v2) and the Archer C5 (v1.20).

For firmware revisions before 3.14.1 (140929), the router looks for an IP address of 192.168.1.66 and a file named ArcherC7v2_tp_recovery.bin. Firmware 3.14.1 updates the bootloader to look for an IP address of 192.168.0.66 and a file named ArcherC7v3_tp_recovery.bin even on hardware v2 units. Some v1.1 units may also look for ArcherC7v1_tp_recovery.bin. The model Archer C5 looks for the file ArcherC5v1_tp_recovery.bin.

To activate TFTP Recovery press and hold WPS/Reset Button during powering on until WPS LED turns on. Setup your computer to 192.168.0.66 (SubnetMask /24 = 255.255.255.0) and connect it to LAN1. Start TFTP server and provide recovery file with it.

For de-bricking with an OpenWrt image use the factory.bin image. :!: In case you are flashing back original firmware, make sure original firmware image name does not contain word boot → return_to_factory_firmware.

TFTP de-brick Alternative

Use the Cut file above and rename it ArcherC7v2_tp_recovery.bin
Change your Ethernet adapter to IP 192.168.0.66, subnet 255.255.255.0, gateway 192.168.0.1
Download Tftpd32 by Ph. Jounin at http://tftpd32.jounin.net/tftpd32_dow...
Browse to the directory that hold ArcherC7v2_tp_recovery.bin file.
Choose 192.168.0.66 for your "server interfaces"
Choose Tftp server tap
Activate TFTP Recovery press and hold WPS/Reset Button during powering on
Recovery using serial connection

Connect to your router via serial, power it up, then type "tpl" until the boot process is halted and you should be at the console. Set up a TFTP server with your firmware at 192.168.1.100, then run the following commands:

V1

The V1 is different because it only has 8mb flash not 16mb that the other version do.

tftp 0x81000000 [name of your firmware file].bin
erase 0x9f020000 +7b0000
cp.b 0x81000000 0x9f020000 0x7b0000
reset
V2

tftp 0x81000000 [name of your firmware file].bin
erase 0x9f020000 +f80000
cp.b 0x81000000 0x9f020000 0xf80000
reset