private exe protector unpacking?

[0xall0c]

little more debugging and i get to know that the pattern function in some way compares some bytes with another bytes generated from the same function, so right now i am patching the function to contain [ebp-1] = 0, what if i make [ebp-1]=0 with valid data not patching then i think i would not get the exception as the same data is later getting xored with the real oep section? is this correct?