primary bootloader

[kRaje.1]

Hi, I am using the STM32F429ZI microcontroller. I entered primary bootloader mode using the STM32CubeProgrammer option bytes through the ST debugger. My question is: Can I load my LED blinky code (hex file) using the primary bootloader (system bootloader)? Also, STM32CubeProgrammer is not detecting the primary bootloader via USART or DFU. How can I connect?

[TDK]

Hold BOOT0 high and BOOT1 low during reset to enter the system bootloader. You cannot do so through option bytes. Ensure connectivity is correct between the computer and the board.

If you're having issues, post enough specific information to convey what you're doing, what hardware, connections, etc.