Issue with STM32 Core: Board Not Detected After Upload / Red SYS LED

[lazyvole]

Hello everyone,

I’m working with an STM32 board (please let me know if I should provide the exact model) and I’m running into an issue after uploading new firmware using STM32 Core.

After flashing, my board shows a solid red SYS LED and is no longer detected over USB (no COM port shows up). There’s also no display output (this board has a display module connected).

Here’s what I’ve tried so far:

Followed the standard recovery steps: unplugged the board, waited ~30 seconds, plugged it back in — no change.

Attempted to enter DFU/bootloader mode by holding down the BOOT0 (or mask) button while plugging in — the SYS LED stays solid red and nothing changes.

Verified power supply and USB cable.

Has anyone encountered this behavior? Are there additional recovery steps or jumper settings I should try to reflash or reset the board?

Thanks in advance for any advice!

[GonzoG]

Not enough information.

1. are you 100% sure the LED shouldn't be on ??
2. did you set it up to have com port ??
3. do you connected it to correct usb port ??
4. my crystal ball run out of magic juice... which board you're talking about... ??

[ag123]

Provide the board details, stm32 chip used etc.
there are a large number of stm32 soc all with different features, capabilities.
board details is also important, if it is well known board, a board on the list
https://github.com/stm32duino/Arduino_Core_STM32
mention it, otherwise provide more details, if possible provide a schematic, with external crystal frequencies if used etc