DI-149/HS can't record at more than 240 S/s

DI-149/HS can't record at more than 240 S/s

I have a DI-149/HS kit, S/N is 54EC8E86, but the displayed S/N in HELP, About is 54ECFFFF03. I tried to unlock the device with the corresponding  PID, but displayed "value is illegal" . So I can't record  at more than 240 S/s. Why this happened? How should I do? Thank you.