1. Download and install mobile phone management software, such as Cheetah Cleaner or 9 1 Mobile Assistant, to further clean up the cache, system and uninstall the residue;
2, WeChat cleaning, the method is:
The videos saved by WeChat are in the directory corresponding to everyone in Tencent/WeChat.
(1) Connect the mobile phone to the computer.
(2) Open the mobile phone memory card and find the Tencent /MicroMsg folder.
(3) There are one or more folders consisting of a long string of numbers and letters, corresponding to the registered WeChat account of the mobile phone.
(4) Open these folders. Video is video, image is a cached picture, and voice is voice.
If necessary, save it on the computer; If you delete all the things you don't need, you can free up a few g spaces.
The second way: brush the phone back to the lower version of the system.
Once the mobile phone system is upgraded, it is impossible to return to the previous lower version system by restoring the factory settings in the mobile phone settings. Unless, you can only go to the after-sales or repair shop to find a professional technician to help you brush the machine and repaint the lower version of ROM.