How to downgrade iphone when upgrading ios 10?

Step 1: Turn off the Find My iPhone function.

1 Remember to reopen the click settings after recovery-iCloud slides to the bottom, and closes the search for my iPhone (you need to enter the password of Apple ID).

Step 2: Download the degraded firmware of the corresponding model and back up the data. We can find the model of the machine after "model" or "model", such as A 1723 of iPhone SE or A 1633 of iPhone 6s, etc. The model number can be found in the laser engraving on the back of the machine. After confirming the model, we can download the corresponding iOS 9.3.2 firmware and connect the mobile phone with the computer with the data cable. The model number can be found in the laser engraving on the back of the machine.

3 After the backup is completed, also in the summary interface of iPhone, press and hold the Shift key (option key on MAC) and click Check Update. In the pop-up dialog box, find the previously downloaded iOS 9.3.2 firmware location and select the brush file, and the process of restoring to iOS 9 begins. Wait a little patiently, stay connected, and the stable iOS 9 will come back soon!