In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

Aside from possible circuit errors, the only times I have ever had this problem (and it does happen with some regularity) is because of dirty connections between the Key and programming header and/or overly long wires between the programming header and the chip. Basically dirty/noisy connections between the Key and the SX will cause this consistently. Short wires and cleaning pin headers usually solves it.

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