How to change the compiled program, is it possible at all?

Question

linux

There is a small program compiled for Linux, the source codes were in C. You need to cut / change the condition of one check, or pull out a working version of a piece of the program itself. How and what to do it?
PS
We tried IDA PRO; RecStudio; boomerang;
RecStudio produced non-adaptable text, boomerang - cutting out a condition check and a piece of code.

Answer 1

As a result, we used - IDA PRO;Hexplorer;W32dsmv.
In IDA PRO/W32dsmv there was a line with a conditional check, in my case - jle; In the corner of IDA shows the address of the selected line in the file itself. Next - find the desired address in Hexplorere and replace two bytes with 90 and 90 (nop);

Answer 2

There is a small compiled

It's easier to write your own from scratch.