How to enter an empty password when the vivo mobile phone is turned on?

This problem may be that the system of a third party has been brushed or the software of a third party has been downloaded. I suggest you try double cleaning:

1. Press and hold the lock button 10 second to restart the phone, and then press and hold the lock button and the volume plus button at the same time. When the vivo interface appears, release the screen lock button and continue to press and hold the volume plus button until you enter the recovery mode. Select Erase Data/Restore Factory Settings to erase all data/restore factory settings; Erase the cache partition to clear the cache. After the interface jumps, select Restart System Now to restart the phone.

2. If it still can't be solved, it is recommended to try firmware upgrade: you can go to official website to download the firmware package of the corresponding model. Path: Go to the homepage of vivo official website-Services-Search for the corresponding model, and click Resource Download to download the firmware package. Specific operation tutorial: Go to official website Home Community-Plate -V Powder Play Machine-Play Machine Skills-Search official website Firmware Upgrade Operation Tutorial. There are detailed steps in this post.