Flash JHEMCU_GF16_F405 via Serial port

Hello, I am currently trying to update my FC with a raspberry pi 0W via a serial link. I updated the bootloader by defining the tx and rx ports. Is there anything else to do because when I run my command : ./uploader.py --port /dev/ttyAMA00 --baud-bootloader-flash “115200” --baud-flightstack “115200” …/…/…/ardupilot/build/DRONVOR/arducopter.apj
The command gives this result :
If the board does not respond within 1-2 seconds, unplug and re-plug the USB connector.
Attempting reboot on /dev/ttyAMAO with baudrate=115200…
If the board does not respond, unplug and re-plug the USB connector.
Attempting reboot on /dev/ttyAMAO with baudrate=115200…
If the board does not respond, unplug and re-plug the USB connector.
Attempting reboot on /dev/ttyAMAO with baudrate=11520O…
If the board does not respond, unplug and re-plug the USB connector.
Attempting reboot on /dev/ttyAMAO with baudrate=115200…
If the board does not respond, unplug and re-plug the USB connector.

He can’t find the FC or can’t communicate with it.
it’s in an OEM setup based on the JHEM_JHEF405 board