I use both the UART an CAN bootloader versions of the T89C51CC01 and encountered following problem : the XROW data on location 30h should contain the manufacturer code 58h. Some of the components that I tested have 00h at this location.
When I compared the complete XROW data, several were different. All the components that I have tested do function properly, except that the WROW data doesn't match the datasheet.
Does anyone has an idea on this or has found similar things ?