[ton414]

You should not replace the original button, you make a backup of it.
you do not need to reinstall HSFX just put back the original button his place
Original button HSFX 5.0.1:
http://www.mediafire.com/file/arj1i7kd1w...buttons.7z

In my case here:
C:\Ubisoft\IL-2 Sturmovik 1946 HSFX 5.0\Files\gui\game\buttons