1. Connect TTL to USB cable to PC.
  2. Start up putty and connect by serial to the COM port powered by Prolific @ 115 kbps.
  3. Power up WRT1900AC.
  4. Press spacebar when you see lines scrolling in the putty terminal.
  5. Run tftp server on machine at (or IP of machine in instructions below).
  6. Enter following commands into putty terminal:
  • setenv firmware_name firmware.img
  • setenv ipaddr
  • setenv serverip
  • setenv netmask
  • run flash_pri_image
  • reset