Please follow steps below for troubleshooting:
- Launch Camera and check if you can take a photo by pressing volume key
Note:Please set volume key as shutter by launching Camera > tapping upper-left gear icon > Set volume key as Shutter - Reboot your tablet
- Access Safe Mode by long pressing power key > tapping and holding Power Off > tapping OK
If your tablet works well in Safe Mode, there may be some 3rd apps that cause malfunction
Please reboot your tablet and check again if it works well - Backup your data and perform factory data reset