how to downgrade apple watch from 3.0 back to 2.2.1?

I see echoes of 2-3 business days for turn around ship-back with successful downgrades to 2.2.1.

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Start a service request and ship it to them. Just be honest in your description and the recommended option should be to send it in for repair.

On your Apple Watch tap Settings > General > Reset > Erase all Content and Settings

That will restore your watch to factory settings and OS 2.2.2.

Carolyn Samit wrote:

On your Apple Watch tap Settings > General > Reset > Erase all Content and Settings

That will restore your watch to factory settings and OS 2.2.2.

Erasing all content and settings would not downgrade watchOS (or any other Apple operating system).

You will have to get it replaced by Apple. As a developer you need to contact them using your developer credentials to arrange this. If you are not a developer then you may have to wait until WatchOS 3.0 is officially released.

Thanks but you can go back to the current iOS version > About iOS beta software - Apple Support

That will work for iOS if you put the iPhone in Recovery mode and Restore it from your backup on a computer but that will not work for WatchOS (or the appleTVOS for that matter). That is why there is no public beta for the WatchOS.