| Error Message | Cause | Solution | | :--- | :--- | :--- | | Device not found | Driver issue or charge-only cable | Reinstall drivers, try different USB port, use a data sync cable | | Checksum error | Corrupt PAC file | Re-download firmware from a different source | | Sending bootloader failed | Wrong firmware version | Verify you have TA-1174 firmware, not TA-105 or TA-1209 | | Flash timeout | Battery too low or loose connection | Fully charge battery, clean USB port | | PAC file is invalid | Tool too old / file corrupted | Update to SPD ResearchDownload v5.2204+ |

Several sites rank high on Google but host dangerous files. Avoid:

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