No Longer maintained Please use GnuBee_PCx_uboot
Forked from pinney/MT7621-u-boot-mod @ commit 5688587b9031073d95c8af5e878cf6ce8f3c0962
Flashing the bootloader is risky.
If you like expensive bricks proceed without caution.
You will need a working Serial Console and a TFTP server.
From the Serial Console (UART) : Option 9
https://github.com/gnubee-git
----------------build:Jan 17 2020 17:08:33 --------------------
Please choose the operation: 1: Load system code to SDRAM via TFTP.
2: Load system code then write to Flash via TFTP.
3: Boot system code via Flash (default).
4: Entr boot command line interface.
5: Load system code then write to Flash via Httpd.
7: Load Boot Loader code then write to Flash via Serial.
9: Load Boot Loader code then write to Flash via TFTP.