How to Load the Bootloader on GiGA WiFi KM08-708H Devices via UART

I have a set of GiGA WiFi KM08-708H devices that lack a bootloader. The technical specifications of the devices are as follows:

  • CPU: MT7621AT running at 880MHz (Dual-Core)
  • RAM: DDR3 with 256MB
  • Flash: NAND without SPI
  • USB Port: USB 2.0, 1 port
  • Power Requirements: 12V/2A
  • Ports:
    • 1 WAN port at 10/100/1000M
    • 4 LAN ports at 10/100/1000M
  • Platform: ramips

I encountered an issue where these devices do not have a bootloader, and I would like to know the best method to load a bootloader via the UART port. Can you provide guidance or instructions on:

  1. The necessary equipment for the loading process via UART (such as cables and serial communication software).
  2. The detailed steps for loading the bootloader onto NAND flash using UART.
  3. Any special considerations or warnings to keep in mind during the loading process.

If you have any experience or information that could assist me with this matter, please share it. Thank you in advance for your support and help.

If there's no boot loader, you probably need a flash writer to get one there ?