How did Apple 6plus get a black screen when it got to WeChat information?

According to your description, since you can't determine the model of your mobile phone, if it's an Android phone, I suggest you try the following methods:

1. It is recommended to enter Settings-Application Manager-All-

Wechat, photo album

-Clear data attempt.

2. It is recommended to uninstall and reinstall the software, or try to replace it with another version of the installation.

3. Check whether software programs such as mobile phone security guards are installed in the mobile phone. If there is an attempt to uninstall, please check whether the installed third-party software is incompatible or caused by software restrictions.

4. Take out the external SD card for testing.

5. Back up the data on the mobile phone and try to restore the factory settings of the mobile phone before installation.

6. Test after updating the firmware version of the mobile phone.