If you have got corruption in your OST File and then you use a scanost.exe tool to recover and found that it didn't work for you like this tool shows you no error found but your files got corrupted so for accessing your files again try an OST To PST Converter tool that can help you to convert your recovered files into pst or many other formats.

you can try its demo version also to check its potential to recover files and;

To know more about this tool read this slide: https://issuu.com/ostpst...ry/docs/pptbad0.ppt.pptx