What should I do if I want to restore my previous system after upgrading my mobile phone 6S plus?

Turn off "Find My iPhone Function"

2. Download the corresponding model of degraded firmware

According to the model of our mobile phone, download the corresponding model of iOS 9.3.5 firmware (the version is stable), and connect the mobile phone to the computer with a data cable.

3. create an iTunes backup

after the backup is completed, in the iTunes interface, hold down the Shift key and click check for updates ("check for updates" can be downgraded on the premise of retaining data), browse and find the downloaded iOS 9.3.5 firmware and select it. at this time, we will wait patiently for the return of iOS9.3.5.

after success, back up your phone again. Because it's already the iOS9 system. Make a backup for data security. However, at this time, you can't use iTunes to back up (to prevent automatic updates), and you can use Kaixin mobile phone to restore the master backup. (The brilliant point of Happy Mobile Phone Recovery Master's backup is that you can access and view the independent items in your backup. Happy Mobile Phone Recovery Master can view and even export important data such as WeChat chat records, address books and text messages in your backup by scanning your backup. Including iTunes backup. Happy mobile phone recovery master can also view the independent project data in the backup.