Many mobile phones have built-in fonts, which can only be replaced by smart phones. The font formats supported by smart phones are the formats used by the system, such as SIS, SIXX and APK.

first, get the root permission of the mobile phone. Search the Internet and download the "z4Root" program, whose function is to obtain the Root right of the mobile phone.

use the data cable to connect the mobile phone to the USB interface of the computer. At the same time, open the "USB debugging" function in the mobile phone. Opening method of USB debugging function.

make sure that the "pea clip" or 36 security guards are installed on the computer. Then right-click the z4Root installer, click "Open mode", select one of the APK installation modes, and then install the APK program.

Search and download "RE Manager" on the Internet. This program can modify the system files in the mobile phone at will, and it is very powerful. Search and download your favorite fonts online. Decompress the downloaded fonts. Then copy it to the memory card of the mobile phone, and rename the font file as "DroidSans.ttf" and "DroidSansFallback.tt".

back up the existing fonts of your phone. Run the "RE Manager" in the mobile phone, and you will be asked to get Root permission when the program is running. Click "Authorization" in the authorization window that pops up. In the opened explorer window, find the Fonts folder under System, and copy the font files "DroidSans.ttf" and "DroidSansFallback.ttf" under this folder to a folder in the SD card for backup. The method of copying files is shown in the figure. (Long press the file name will pop up a menu, which contains the command to copy the file).