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If your product label has a W/N number, it can be used as an alternative to the serial number.
If your product does not have any S/N or W/N, you can enter the Part No. instead.
Please refer below information:

 

No. Your receipt is the only proof of purchase that you need to validate the limited warranty that accompanies your Product. If you are unable to present the proof of purchase, the S/N on the product is mainly used.

Please verify that the write-protect lock of the card is off. If the problem persists, please change another card reader to shoot machine trouble. If so, please contact customer service for RMA process.