Neoprogrammer 21019 Ch341a Hot

| Error | Likely cause | Fix | |-------|--------------|-----| | Chip not responding | CPU not in reset / bad connection | Hold reset low; check clip alignment | | Verification failed at 0x0000 | Voltage drop or contention | Use thicker wires; separate power sources | | Write timeout | SPI clock too high | Reduce speed in NeoProgrammer settings | | ID mismatch (FF FF) | No VCC to chip | Provide 3.3V to chip from somewhere |

But with caveats.

NeoProgrammer is a popular, portable alternative to the standard Chinese software, often preferred for its broader chip support and stability. CH341 Programmer 3.3V Fix | Voltlog #318 neoprogrammer 21019 ch341a hot