This happens because Facebook’s servers force a token refresh. If version 4120005 cannot reach the new OAuth endpoint:
Users on older Android OS (such as Android 7.0 to 9.0) frequently look for these versions when the standard Play Store update fails to load or causes system lag. How to Find and Install Older Versions facebook 4120005 apk older versions for and work
When downloading APKs outside of the Google Play Store, it is vital to use reputable repositories to ensure the files are safe and unmodified: This happens because Facebook’s servers force a token
