Navigate to C:\ProgramData\Cummins_Inc (you may need to enable "Show hidden files" in Windows).
Voltage drop is the silent killer of ECM communication. Do not trust that "12V" is actually 12V under load. Cummins Insite Error 3003
If a calibration download or software update is interrupted—perhaps due to a power saver feature turning off the PC or a loss of connection to the datalink adapter—the resulting "half-finished" data can cause a mismatch error. Troubleshooting and Solutions Cummins Insite Error 3003