I have newly release the second version of my app on App Store. But there is a bug with it.
How can I remove the newest versjon on itunes connect, and go back to the previous one? Namely the first version.
Unfortunately Apple doesn't let you remove the current version and go to previous version. What most of the developers do is we fix the bugs and send an updated version as soon as possible to avoid crashes/errors etc.
The good news is Apple now reviews your updates quicker than before. From 8 to 24 hours as opposed to days or even weeks in the past (provided your app follows Apple's guidelines).
Good luck sending out the updated version with the bug fixes! Let me know if you have other questions.