Hi, We are unable to change the Serial Number using the JLink Commander, an an auto assignment happens irrespective of writing to the any of the address location For example wconf 8 01 wconf 9 C1 wconf A A4 wconf B 31 and when we read back after rebooting the board. We get FF FF FF FF instead of the values written Board : RENESAS EK-RA4M1 Please help us with the resoltuon of workaround We see an issue with v7.66e and higher wiki.segger.com/J-Link-OB-S124-Renesas#Serial_number