How does Apple delete the memory of its own system?

Apple phones can delete the memory of their own systems as follows:

Tool: iPhone? eight

Operating system: iOS? 14.4. 1

Step 1: First, open the main interface of the mobile phone and select the "Settings" option.

Step 2: After entering the setting interface, select the "General" option, as shown in the following figure. ?

Step 3: After entering the common interface, select the "iPhone storage space" option.

Step 4: After opening the iPhone storage interface, select the "IOS 12. 1.2" option.

Step five. Finally, click the Delete Update option to free up memory.