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BackAfter Your receipt of the bad trace. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge.
- 9 Ball, 3x3 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l496wg.pdf ST.
- M2.5, DIN965 mounting hole.