Nope SCPI does not work and i tried the file on USB stick method. Did take the file but shown a "Installation fails" message as i get while manualy entering it.
I have recheked many times that the serial number is indeed right, later tried copypasting it from SCPI and it was indeed indetical. And i repeated the firmware upgrade process in case something went wrong, still the same. Is it possible the riglol tool has a bug for certain serial numbers?
Here is how i generated it "riglol.exe DP8C155202659 F3PT" and it gave me "MLFLLA33AF6UKN3LTPA7Z43TGKVT". I have attached the .lic file i used(renamed to txt)