How to restore SMS after the white apple

Well, when you opened 9 1, you were reminded to back up. Do you have a backup? Backup, try to restore! If not, you can only go to the after-sales department and restore Apple to the previous version! I hope the data will not change and will not be lost. I made a mistake once, and it was also a white apple. If I download the firmware, it will be fine. The data is all there. You try. If there are no problems, the data are all there. If there is a big problem, I can only brush the machine or find a master to recover. .