Not having access to books is the reason why there is no root authorization. After obtaining the ROOT permission of the mobile phone, you can uninstall the preset applications in the mobile phone or burn the third-party firmware in the mobile phone. You can log in to /cn/ to apply for the official unlock code and unlock it according to the page prompts. After obtaining the ROOT permission of the mobile phone, the mobile phone may not reach the best working state, and some functions may not work normally. At the same time, because the third-party firmware has not been fully tested, there may be problems such as poor compatibility and system vulnerability to virus invasion. Unlocking will bring unpredictable negative effects, so it is recommended to choose carefully. If the equipment can't be used normally and can't be recovered, you need to take your own risks. Huawei's after-sales service outlets can regard software and hardware failures caused by brushing as non-warranty, and charge for ordinary software maintenance outside the warranty.