What do you mean? Did you have an update and now you want to reverse it? Or, did you simply mess something up. If you messed something up, go to your settings. Go to accounts and backup, choose your Samsung account and select restore, then select the device to restore (you may have more than one device backed up). It will restore anything that's different, but leave everything else along (won't overwrite). If just your home screen got messed up and you have Good Lock's Home Up, you can restore your home screen layout (assuming you had backup and restore turned on). If you want to reverse an update, it can't be done.
