It may be that WeChat is undergoing system maintenance, and the avatar, nickname, and signature cannot be modified temporarily. Generally, the avatar can be changed.

The steps to change the avatar on WeChat are as follows:

1. Open WeChat, click "I" at the bottom, and then click on the column above your WeChat name;

2. Enter personal information and click the "Avatar" column;

3. Enter the personal avatar page, click "..." in the upper right corner, and then click "Select from mobile phone album" (to take a photo now) photo, click "Take Photo");

4. Select the avatar photo you want to change in the album, click OK, and that's it;