First, it is crucial to clarify the technical definition. Facebook Zero is not a separate app like Facebook Lite or the standard Facebook app. It is a of Facebook delivered via your mobile browser. It is designed to work on slow connections (2G/EDGE) and basic phones (feature phones) that cannot run modern operating systems like iOS or Android.
For collectors or users reviving old phones, here are the last known stable versions of the dedicated Facebook Zero app (for Java): download facebook zero for mobile
Strictly speaking, the original Facebook Zero app for Android is discontinued. However, you can achieve the in two ways: First, it is crucial to clarify the technical definition