Why won't Facebook and Messenger open after update on the ZTE V5?

Hallo! I have a problem with the zte v5. After the last update of faceboom and messenger the apps don't open. What could i do? I have already done reboots but nothing happens.. Please help me ☺

Hi popi. Try installing CleanMaster (link), then uninstall Facebook and Messenger. After uninstalling both apps, run CleanMaster to remove left over files. Restart your phone and install Facebook and Messenger. Let me know if that works.

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