How to turn off vivo mobile phone engineering mode? Note: I know that 558 can be turned off, but it will appear after restarting the phone. How can it be eliminated forever?

If you enter "*#558#" in the dialing interface of the mobile phone, and enter the factory test → quality verification test → close the "debugging port" and restart, there will still be engineering mode. It is suggested that you can go to vivo official website-Services-System Upgrade-Check the phone model and try firmware upgrade.

Note: Do not click other options in the factory test interface during this operation. If you click other options, all the problems caused by mobile phones will not be guaranteed. Please operate with caution.

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