Why does the signature verification of VIVO mobile phone fail? How to solve it?

Try to upgrade after changing the mobile phone network;

Go to Settings-More Settings-Applications-All-Find System Upgrade-Click Clear Data, and then download the update package again to update;

Connect the mobile phone to the vivo mobile assistant on the computer side, and then click My Mobile-Upgrade according to the prompts in the mobile phone upgrade.

Note: If the mobile phone is too rooted, it cannot be upgraded online. Please brush the firmware to remove the root directory before upgrading.

How to do the electronic signature of individual users?

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