Downgrade to A1601EX_11_OTA_019_all_201610112241_local.zip
Download kingoroot from here, obtain root
install flashify from playstore
Download custom recovery here, flash it using flashify
Turn off phone, go to twrp (vol down + power), make a backup first
Download supersu, flash it using twrp
Download supersu from playstore and update it!
Directly install xposed framework from it.