Starting a custom BMP with bootloader and custom firmware

[Ludovic37-center]

Hello,
At my company, we designed a card with 4 BMPs (STM32F103) for mass programming of other cards.
We used the version 2.1c schematic.
I compiled version 2.0.0 of the firmware and bootloader.
I managed to flash the bootloaders in the four STM32F103s.
I changed the Option Bytes: Data1 = 0xFB and Data0 = 0x04.
In USB, I see four “Black Magic Probe DFU 06b6525-dirty.”

When I flash a card (bmputil-cli) with firmware 2.0.0 or specific firmware, the procedure goes well, but I have the impression that the BMP does not start.
Then the programmed BMP no longer appears in USB.
Is there an additional operation to perform to start the BMP?
Is it possible to debug the firmware? Or get messages on a debug console?
Thank you.
Best regards.

Translated with DeepL.com (free version)