Why I can't change instruction to it's previous values (function call) OllyDbg

Question

I was trying to revert the changes made to an exe file by some other person. When trying to change assembly to it's previous values - from DD 00B2CD90

to DD 00521088

I'm getting this result.

MOV BYTE PTR DS:[EAX],DL PUSH EDX

how I can get that call back?

Answer 1

You are doing everything correct, the bulit-in olly disassembler just tries to resolve opcodes into assembler instructions, but this is only for visual purpose. As long as you are modifying the non-executable section of code (and it looks like .data section) you can ignore the disassembly output generated by Olly. I recommend to modify data like this using the dump window.