Why can't I update my old version FB on my o+ phone?

[AC Question]

why i can't update my old version fb on my o+ phone?

Every after it finish downloading the update, fb app hangs and send me back to my home screen.

 

[B. Diddy]

Re: why i can't update my old version fb on my o+ phone?

Welcome to Android Central! What happens if you uninstall Facebook completely, then install it again from Google Play Store?