I have upload a video demo in YouTube ,follow me.

https://youtu.be/4sA4mPmDFzs?si=0njlEI5IADUwLXOr

1,  Enter flash mode

sudo curl https://www.bi7jta.org/files/fm-patch/firmware/old-fm_1.enable_flash_mode.sh | sudo sh

2, Manual operation

Disconnect Power supply, ---->> PowerOff ---->> 

Short BOOTO on the board  ---->> Power ON​​

Once enter Flash Mode, you can take off the BOOT Jumper

3, Run flash script

sudo curl https://www.bi7jta.org/files/fm-patch/firmware/old-fm_2.booto_upgrade_repeater_FM-20201214-stable.sh | sudo sh

4, Exit flash mode

sudo curl https://www.bi7jta.org/files/fm-patch/firmware/old-fm_3.exit_flash_mode.sh | sudo sh

Tools:  WebSSH, Windows PowerShell, WinSCP,