i had some trouble with the serial number of an ATMEGA4808. I had three different devices. Two of them had a prefix as expected starting with 30 43 47 47 44 51. Then i had a third device, where the Serialnumber (SERNUM0-SERNUM9) where set to something different. converting this string to ASCII led to 'unknown' as you can see in the attached image. I think this might have been an errror in production. Does anyone had this issue before?
Thanks for any help.