Erm. What?
Simply put, the values are 0 or 1 in hexadecimal. there is no "value with "x" in it".
The "x" in 0x00 or 0x01 is a representation, to show that the value is in hexadecimal.
For example, if I simply type 16, I could confuse some, as 16 in decimal isn't the same as 16 in hexadecimal.
The fact that I had to explain what I meant, let's just chock if up to that XD
Also, the thing about hex editing, if you're modifying the values,
each half byte/nibble has the range of 0 to 15 in decimal (which is 0 to F in hexadecimal).
Hex values don't have an "x", and will not present as an "x" in the hex values portion