Hi Simon, Thanks for sharing it. I have a couple follow up questions for your custome PCB: 1. Did you have the VCAP and Decoupling cap for VDD and VSS? This could be affecting how the MCU operates 2. What is the value for the capacitor attached to reset (which should be a pull-down capacitor)? 3. Is the resistor in your board attached to nRST? What is its value? Best Regards, Diego Abad
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