STM32CudeProgrammer tries to start connection and MCU responds, but too late?

[jlthompson]

I'm trying the program an STM32G0B1RET with the STM32CubeProgrammer. It seems the programmer sends a 0x7f and the MCU responds, but maybe too late to connect?

[jlthompson]

And BOOt0 is being held high:

[TDK]

Does your program use that COM port? Doesn't look like the bootloader is responding, but something else.

BOOT0 is ignored on default option byte settings. See AN2606 for how to start system bootloader.

[Tesla DeLorean]

It's the wrong response.

What has been programmed into this part?

Can you program your own app via SWD, ie SWDIO/SWCLK ?

Using PA2/PA3 ? anything else wired to the MCU?

https://community.st.com/t5/stm32-mcus-products/programming-a-virgin-stm32g0b1/td-p/829926