The bloatware apps will still be there but the trailer might be deleted. Save to SD card, just in case.
Not sure why but I always do that when I get a new device. It just ensures that the device is fully wiped and all settings are reset to default.
ok, will try to backup trailer to SD card first when I hv the phone.
Still I hope those who factory reset their Z2 could tell whether the trailer stays

higher resolution comes with a price..