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Everything will an to Play Shop Update Facebook Version ,you device z5 something stop App,i don't know is Android 7.1problem or you product problem,Very use not Good ,Next you out the all phone ,i think I not buy you product,and you this processor all can update to the android 8.0,i think you device is very lost phone.
if the problem it's a third party app (facebook) it is up to the app developer (facebook) to fix this issue, not Sony