Update README.md

[cosmopol]

error in example? For me it only works the other way round!

[cedricbambooza]

Are you sure?

I think I copy pasted the line to extract BIOS from a Macbook Air and it worked very well.

I'm also not sure if the order matters, thinking you might only give the output files there names.

What then would mean that the original dump is called modified image and vice versa in your case.

[orangecms]

-O is for output, the last argument is the input file