nucleo-WL33CC1 bricked?

DirkH · ‎2026-05-15

I have a Nucleo-WL33CC1 board which has been working fine, but after starting to work on a DEEP SLEEP implementation I can not connect any longer using SWD neither through Crossworks IDE nor CubeProgrammer. Any possibility to unbrick the board?

DirkH · ‎2026-05-16

After removing SB2, SB3 and SB5 on MB1801D and shorting CN3.5 and CN3.7 I could connect using the UART in STMCubeProgrammer and make a full chip erase.

Now debugging using ST-Link on MB1801D can continue.

View solution in original post

Andrew Neil · ‎2026-05-15

@DirkH wrote:
after starting to work on a DEEP SLEEP implementation

So are you disabling the SWD pins? Connecting under hardware reset should work

Have you adjusted any board links/jumpers/solder bridges?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

DirkH · ‎2026-05-15

No, I have not changed any links/jumpers/solder bridges. I forgot to set PWR_CR2_DBGRET bit. I tried to connect CubeProgrammer in several ways:

Pushing RESET button before connecting tyrying Mode:Under reset and Reset mode:Hardware reset in the settings

Trying a jumper cable from CN3.7 to CN3.16 to pull BOOT0 high

But I can not get any connection. ST LINK and Board are still detected but after that Error:unable to detect core ID

DirkH · ‎2026-05-16

After removing SB2, SB3 and SB5 on MB1801D and shorting CN3.5 and CN3.7 I could connect using the UART in STMCubeProgrammer and make a full chip erase.

Now debugging using ST-Link on MB1801D can continue.