Card swiping: generally, you need to obtain root permission, and sometimes you may need to swipe it in the third-party recovery, then save the card swiping package to the memory card completely, then operate the mobile phone to enter the recovery interface, and install the upgrade package on the memory card after double clearing.
Line brush: Generally, the corresponding brush driver is installed on the computer, and then the upgrade package is brushed into the mobile phone through the line brush software. (My last mobile phone, 360N6, was upgraded to Android 8.0 in this way, and I specially bought an engineering line. )
Soft brush: it means that after cracking the root authority of the mobile phone through some software, the installation package is directly selected on the mobile phone software. This method is relatively simple and requires no brains, but many mobile phones may not support it. (My Lenovo a8080t supports this brush machine. Change the system every time the phone gets stuck, haha. )
Factory brush: send it directly to the factory to brush, which is more secure!
It is risky to brush the computer. You'd better back up your files before you brush your computer. You have a spare mobile phone. Drawing bricks is not fun. My cool Qing Chuan version is still lying at home, but I guess there is something wrong with the hardware root system of that mobile phone.