AVRISPMKII shows wrong Serial Number

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I bought 2 AVRISPMKII from the Atmel Shop.
I use up to 8 AVRISPMKII for production programming. When you use more than one ISPMKii, you need the serial number. But the serial numbers of the new devices show "ffffffffffff".
On the back of the device it shows someting like "0200...."
My older ISPMK2s show the correct serial Number in the device manager.(the same as printed on the back of the device)
Is it somehow possible to change the serial Number ? Or is there a solution to use atprogram with more than one MK2 that use the same serial number ?