increment a value at an offset in hundreds of very large hex files linux

[Eruditass]

I have a lot of very large hex files that I need to change one value at the same offset and save to another file. I have a script that finds each file and just need to put an operator for each file.

I think sed might be able to do this but I have not used it before and would like some help. If it can't do it by offset, I believe the section before it and after it in every file, and the one value needs to be incremented.

Thanks!

[PeejAvery]

Sorry, but that post is kind of confusing. Can you clarify yourself? Maybe include a simple example as to what you are attempting to do?