ADuC842 now reports itself as an ADuC843 with WSD

Question

I have a design with ADuC842 that has worked for many years. Recently after using this ADuC842 several times, it now reports a WSD error 6 when attempting to download new code. I also notice that the MCU now reports itself as an ADuC843 device. What happened? Is there some DATA bytes that I inadvertently erased that might cause this problem? 
 Here is the resulting string that is captured in HyperTerminal window when the MCU is reset with PSEN held LOW: 
 ADI 843 V212 
 This used to say: 
 ADI 842 V217

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ADuC842 now reports itself as an ADuC843 with WSD