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| Problem | Likely Cause | Solution | |---------|--------------|----------| | "Device not found" | Driver signature enforcement on Win11 | Reboot with advanced options > Disable driver signature enforcement | | CRC error during write | USB cable too long or poor shielding | Use a high-quality shielded USB 2.0 cable under 1.5m | | Software crashes on MCU selection | Corrupted chip database | Replace the Xprog.chp file from the hot download backup | | Adapter not recognized | Firmware mismatch | Re-flash the programmer’s firmware via Tools > Update Firmware |

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