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| Symptom | Likely Cause | Fix | |---------|--------------|-----| | | CAN bus noise / weak battery voltage | Use a stable external 12 V supply or a CAN‑bus repeater . | | Checksum mismatch | Incomplete write‑protect removal | Ensure the ECU is in “Read‑Only” mode; do not click “Enable Write”. | | Software can’t find ECU | Wrong COM port / driver conflict | Reinstall the KTM‑Link 2 driver ; verify the device appears in Device Manager (Windows) or dmesg (Linux). | | File size is 0 KB | Cable not fully seated | Disconnect and reconnect; try a different cable. | | Flash error after custom map | Incorrect map length or wrong checksum | Always re‑calculate the checksum using the editor before flashing; keep the map size exactly 256 KB (or the size reported by the ECU). | Ecu Redleo Mapping Download --39-LINK--39-