After watchdog for dual-config is enabled, the FPGA seems like not work properly every dozens of seconds. Why?

Hi,

If you would like to add unique serial number into UFM then you can only use hex file to incorporate into POF and program into the UFM.

The other method is to use System ID Periphery Core IP (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_embedded_ip.pdf Chapter 40) to incorporate the ID for each of your system design.