What's the matter that a message 106902 on Huawei's mobile phone cannot be deleted?

It may be cell phone poisoning or system failure. The steps of this solution are as follows:

1. Back up what you need on your mobile phone, such as study and work documents.

2. Download the original card file of the same mobile phone model to the computer;

3. Format the mobile phone memory card and completely restore the factory settings;

4. Copy the original card file just downloaded back to the memory card;

5. Put the card back in the phone.