How to turn off the built-in antivirus software of oppo mobile phone?

Click Enter System Security to open the unknown source.

Specific steps:

1. Turn on the mobile phone, enter the main screen, slide the screen to the right, then see a negative screen, enter the word unknown in the search box, and then click the first one. After entering, you will see the mobile phone settings and open the unknown source.

2. Go to Settings, click Mobile Settings, click More Settings, click System Security, and open an unknown source. If you want to turn it off, click it again to turn it on. After closing it again, there will be a warning prompt. Click OK to ignore it.