Panasonic KX-TD7685 Service Manual page 27

5-4. Click "Download".
Then start communicating PC with the target.
Don't release the "POWER" key in this step. If the "POWER key is released, uploading will be failed.
5-5.Communication check "OK"
If communication check result is OK, "CRC ok" will be displayed.
If communication check result is NG, click "cancel". Then back to step 5-1 and try uploading again.
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KX-TD7685