============== Flash 115200 firmware ==============

sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.1.enter_flash_mode-not-need-poweroff.sh | sudo sh
sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.booto_upgrade_repeater_Baud115200_troubleshoot_freezing-build20251022.sh | sudo sh
sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.2.exit_flash_mode-not-need-poweroff.sh | sudo sh

============== Flash 460800bps firmware ======

sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.1.enter_flash_mode-not-need-poweroff.sh | sudo sh
sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.booto_upgrade_repeater_Baud460800_J-Star-build20251022.sh | sudo sh
sudo curl https://www.bi7jta.org/files/MMDVM_Firmware/repeater_HAT/reboot_flash/2.2.exit_flash_mode-not-need-poweroff.sh | sudo sh

After execute step 2.1, HAT must enter flash mode, otherwise , flash will never success.

Photo demo:
https://wiki.bi7jta.org/wiki/index.php?title=File:Enter_Recovery_mode_V3F4.png

Video demo:
https://youtu.be/VDdDw2W6GhI?si=LUllmO_1QGx__pF8