itunesconnect App - Revert to previous version

I believe that you can prepare for problems by creating a fallback version with a higher version number and submitting it for approval with manual publishing. That should cause it to be quiescent in your store until you choose to fall back, and you publish it.

I am not certain whether you can then submit improved versions with a lower version number than your fallback version.

I had to do this recently. I was able to adjust a previous version archive. I started by copying the archive and opening the copy, then editing the info.plist files, adjusting/incrementing both the version and build numbers at both the archive and app package levels. Then uploaded to iTunes, which recognized it as a new version.

It is not possible to revert the app version. You can upload the previous version as new version again to fix this. One thing you can do is : "Expediting an App Review" Please check the following link. https://developer.apple.com/appstore/contact/?topic=expedite

Thanks

Here's a snippet from iTunes Connect Help page :

Question: The new version of my app on the App Store has a bug. Can I use a previous version to replace it?

No. You cannot revert to a previous version on the App Store. You must submit a new version.

Source : iTunes Connect FAQ

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Obviously the alternative would be to submit a new build but ask for expedited app review.

But that means that either your app is event-related or you have a critical bug that you need fixed as soon as possible.