EVAL-ADF41020 Freequency Sweep

My customer purchases the evaluation board EVAL-ADF41020 of the ADF41010 and checks the operation.
Customers are using Int-N PLL software.
The customer confirmed the output of about 11GHz - 12.8GHz.
After that, the customer attempted to sweep the frequency using the software 's Freequency Sweep, but it did not work well.
The customer appeals to me that "12GHz" can not be entered in "Stop Freq".
I also confirmed its behavior.
We could not find software manual etc.
Please, please tell me how Sweep works around 12GHz?
(Frequency Hopping operates at 12GHz.)

Best regards