As we reported yesterday, Apple released iOS 8.0.1, then pulled it after reports that some users lost cellular service and the ability to use Touch ID after installing the update.

From Apple’s 8.0.1 support page:

We have a workaround for you if you have an iPhone 6 or iPhone 6 Plus and you lost cellular service and Touch ID functionality today after updating to iOS 8.0.1. You can reinstall iOS 8 through iTunes by following the instructions below. We are also preparing iOS 8.0.2 with a fix for the issue, and will release it as soon as it’s ready in the next few days.

The support page walks you through the process of reverting from 8.0.1 back to 8.0 and closes with this comment:

The Health app won’t work in iOS 8 after these steps. It will be fixed in our upcoming iOS 8.0.2 software update.