This is to inform you that all HP Business Notebooks such as Probooks or Elitebooks have more stringent security than consumer models infact they don't produce 'halt codes', the password cannot be derived from the Serial Number and the
code is stored in non-volatile memory so removing the RTC cell will not reset the password in this case.
So you need SMC.bin - take this
http://breakstuffmajorly.blogspot.com/2 ... 6560b.html