Download of PCD3 firmware fails on END command (NAK response)

FAQ #100742

 

Symptom
After the download of a firmware file the following error message from the Firmware Downloader (FWDnld) appears. The message is "Download failed on END command. Error: NAK response."
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Reason
The reason for this message is a "NAK" (Not Acknowledged) response from the PCD. Before the PCD loads a new firmware, it is verified by the PCD. If this verification fails (because of e.g. a wrong checksum of the firmware of because the firmware is not intended for this CPU type), a NAK response is sent by the PCD to the Firmware Downloader.

Solution

• Make sure the firmware you download is created for the CPU type you have attached (a firmware for e.g. the PCD2.M480 will not run on a PCD3.Mxxx0 system)

• Make sure the file you have downloaded is not corrupted (e.g. while the download from the internet or similar). In case of doubt, re-download it.