How to change the font of iphone4s back to the original font? What if the font becomes a box and a cross?

This can only restore the system. Modifying fonts must be jailbroken, so jailbreaking cannot use the system's restore settings, and iTunes must be used.

1. Install iTunes. Start iTunes.

2. Plug in the iPhone, press and hold the power button and the Home button 10 second, wait for your iPhone to go black (according to experience, it is about 0.5- 1 second after the black screen), release the power button and hold it down.

Until iTunes recognizes your iPhone.

3. At this time, Windows will first find some new hardware and drive it by itself. After iTunes automatically recognizes the iPhone, a prompt box will pop up. "iTunes has detected that the iPhone is in recovery mode. You must restore this iPhone and use it with iTunes. Click OK at this point.

4. Open itunes to display the capacity and information of your iphone, click Restore, and select 1. 1.4 firmware downloaded from the hard disk to start the recovery process.

5. Before displaying the picture of the data cable connection on the iPhone, iTunes will prompt that the firmware recovery is completed.