I want to return my mobile phone to the seller. How to prevent sellers from using data recovery software to recover private data on my mobile phone?

Method for completely clearing mobile phone data:

Manual override control

In fact, files such as information and pictures in old mobile phones can be recovered even if they are deleted. Because the nature of the data recovered by the mobile phone is similar to that recovered by the computer hard disk, even if all the contents in the recycle bin on the computer are deleted, because the hard disk has written these data, the data can still be recovered by some software, which has the potential safety hazard of user information leakage.

Data Recovery Software

However, this is not without a solution, because the data on the hard disk of the mobile phone can be overwritten repeatedly, and the data recovery software can only recover the latest overwritten files, so as long as some useless files are overwritten with private files, even if others want to use the recovery software, they will recover those useless files.

Format the phone first, then fill the memory with some large media files, and then format it, so you don't have to worry about privacy being used by others if you cover it two or three times.

Software-assisted: Android Cleanup Master

Download the software first, then scan the mobile phone junk files, and then click Strong Clean to enter the privacy clean and search. After searching, you will be prompted how much private data you have found, and then click the option with private data below, and there will be the option of crushing. After crushing, you can quit to finish cleaning.

Connect the computer with the top 360 deletion.

Connect the mobile phone to the computer, let the computer read the files of the mobile phone, and then crush them with software such as 360 file shredder.

360 file shredding

Connect the mobile phone to the computer. After installing the driver, let the computer read the mobile phone file package, then right-click the private files that you want to delete completely, select 360 strong cleaning, and then click the stop recovery option to delete the files completely.