I cannot update the IOS

Facebook requires iOS 13.4 or later. 

If you have an outdated iPhone / IPadthat cannot be updated to iOS 13 or later, many apps will not be able to download.

Outdated iPhone / iPad no longer meets the requirements for many apps.

Most apps require iOS 13.4 or later.                                

Considering a newer type of iPhone /iPad?

Read this before you buy a newer type iPhone / iPad.