Devices with Broadcom WiFi chipsets have limited OpenWrt supportability (due to limited FLOSS driver availability for Broadcom chips). Consider this when chosing a device to buy, or when deciding to flash OpenWrt on your device because it is listed as supported.
See Broadcom WiFi for details.
Connect one of the LAN ports to a machine running a TFTP-server. The server machine needs to be configured with IP 192.168.0.66/24.
Obtain a 'factory' OpenWrt image. Store the firmware on the TFTP server as archerc9v1_tp_recovery.bin. Replace the v1 with your hardware version number if you don't have a v1.
To start the TFTP recovery process on the router, press and hold the Reset Button and then power up the router. Keep the Reset button pressed until the TFTP server begins serving the image then release it immediately.
If everything went right, you should see a read request in your TFTP server. The flash operation takes about 3 to 5 minutes.
Archer c9 v1 back to the original software
Attempting to flash the stock firmware using TFTP after using non-stock firmware can result in a bootloop. You may then need to use the serial recovery method
The picture links below are broken. Please avoid links to external sources and upload pictures to the wiki instead.
See howto: Adding images to the OpenWrt Wiki. After you have added the pictures, this FIXME note can be removed.
There are two screws at the bottom of the device, under the rubber feet.
One screew at the back of the device, under the label.
The rest of the case is kept together by latches at the every side of the device.
I started disassembly from up using small flat screwdriver.
→ port.serial general information about the serial port, serial port cable, etc.
If you open the casing and remove the PCB from the chassis, there is a well labeled TTL serial connector near the top between the wireless antenna connectors. It operates at 115200 baud 8N1.
How to connect to the Serial Port of this specific device:
→ port.jtag general information about the JTAG port, JTAG cable, etc.
The JTAG port consists of 10 female pin holes at the bottom of the PCB next to the LAN ports. Still unsure about pin-out.
How to connect to the JTAG Port of this specific device:
toh/tp-link/archer-c9.txt · Last modified: 2020/05/17 09:52 by lee-soft