The two concept of SA-A/SA-C switch and define activating SA-C:
Some people may confuse about the two concepts, so explain them first:  
SA-A/SA-C switch: is set the driver to safe model, that’s the only way to solve the driver
protected problem.
Define activating SA-C: this is the  C  system  area.We  know  that  HIT  has  three  system areas,  SA-A,  SA-B,  SA-C.  Here  is  set  the  SA  to  C,and  we  can  read  the  SA-C’s  mod directly.

When we need choose the “SA-A/SA-C switch”:
If your driver has been protected, as follow, you need to change the driver to SA-C.

In the normal condition, we could choose A, B, C each one in the Define activating SA.  
But when the driver is protected, SA-A and SA-B are prohibited for accessing. So the only
way is switch SA-C and re-write the password mod to solve the problem.
When  you  choose  the  SA-C  switch  and  followed  the  indication,  the  driver  is  working  in
SA-C now, but there is no obvious symbol, so someone may confuse whether the driver is
working in SA-C.

How to judge the driver is working in the SA-C:
Choose the “EDIT NVRAM”, you can see these info as follow:

Look at the fifthly number, the one with one with red frame. Now the number is 0201,
When you after the SA-C switch, choose the “EDIT NVRAM” again, as the follow:

Look at the fifthly number with red frame, it’s turn to 0200 now, so we can sure the driver is working in the SA-C now.
So we could conclude whether the driver is working in the SA-C by the fifthly number in the NVRAM, if it’s end with “1”, it’s in normal status, if it’s end with “0”, it’s in safe model truly.