Hummingbird was not so much of an update, but a new algorithm altogether. It was released on August 2013, and was named Hummingbird because it was “fast and precise”.
The Hummingbird Update took into consideration over 200 ranking signals - the same signals that the old algorithm was using. However, the things that did change were the following:
There is no way to “recover from Hummingbird”, as the rules remain the same. It’s still crucial for you to follow Google’s guidelines by posting original content and acquiring high-quality backlinks.