ROOT:

ROOT is actually the name of the super user in Android system. It has all the permissions in the system and can clean up the system in depth. Processes can be started or stopped, and some of the devices' own built-in systems can be removed. ROOT is commonly referred to get the ROOT account to make the device run more smoothly.

Of course, ROOT also has some risks, because  after having the ROOT account, in case of carelessness,it may result in the system files to be deleted, and the device failure to  function properly. In fact, ROOT is equivalent to Administrator account in Windows system.

Upgrade:

In fact, the upgrade is a common system upgrade, and the upgrade content is the TV box. Some TV boxes are automatic  recognition upgrades and some require manual confirmation, all of which will be improved in android devices.

Of course, some manufacturers also publish the upgrade package on their official websites for users to download and install. Upgrading system is that the manufacturer released a new version, or added new features, or some unstable parts of the previous version has some maintenance and repair.

Flash the device:

Flash the device is equivalent to redoing the system of the computer actually, the data information inside will disappear, so users had better undertake backup to the equipment before flashing the device. Flashing operation is to install different systems into android devices, and the system boot program will be replaced.

Therefore, there is a certain risk of flashing. If the system boot program is wrong or mismatched, it will cause the device to fail to start properly.