1, in the Android system, ROM includes the Android system, the manufacturer's software, user data (documents, photos, videos, installed third-party applications, etc. ). The ROM space is insufficient, so you can expand the external sd card, or back up the user data to the computer to reduce the occupation of the ROM storage partition.

2. You can use mobile phone security software (pictured below is Tencent Mobile Manager) to check the garbage on your mobile phone and clean it up.