| Symptom | Likely Cause | Solution | |---------|--------------|----------| | No device found | GND missing or broken trace | Check continuity between debugger GND and board GND | | Target voltage too low (0V) | VREF not connected to board’s 3.3V rail | Solder a jumper from a 3.3V test point to pin 1 of the link | | SWD protocol error | Clock speed too high | Reduce SWCLK to 1 MHz or lower | | Reset failed | nRESET line held low by onboard supervisor | Temporarily disconnect nRESET; use software reset instead |
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