How to flash DD-WRT over OpenWRT on a Archer C9 v1

https://wiki.dd-wrt.com/wiki/index.php/TP_Link_Archer_C9

  1. Change PC ethernet address to 192.168.0.66 and connect to a LAN port on the router
  2. Open TFTP and serve archerc9v1_tp_recovery.bin on root
  3. Power down the router, press and hold the reset button, power on the router and release the reset button as soon as the file starts to transfer