Lenovo A820 is an Android 4. 1 mobile phone. You can click the root using the Brush Wizard. You can look for tools carefully. It is easy to find. In the above utility, you have the right to delete root.

Turn on the USB debugging of the mobile phone, connect the computer with the data cable, and wait patiently for the brush wizard to start installing the driver, which will take a long time.

After installing the driver, open the root removal tool, and then start brushing with one button. You may fail the first time, try again, and you will succeed at most three times. You can try.

About which programs can be uninstalled:

Music (this is a player, you can uninstall and install a cool dog music, which is much better than that. )

Video (this is a video player, you can uninstall and install a QQ video, fast broadcast and so on. )

Radio, tape recorder, calculator, etc. are arranged as needed.

I don't know what those things are for, so you download a 360 optimization master and find a function called system slimming. In the system program, he will mark some that can be deleted.

Please use your hands only.