If your Internet browsers will not load, check to see that your device is connected to a wireless network. Link to Troubleshooting Page: Lenovo TAB 2 A10-70 Troubleshooting
If your device is not turning on, try charging the device first. If this is not the root of your problem then you might need to try other methods of turning the device on. There is a troubleshooting page that addresses this type of problem. The link is : Lenovo TAB 2 A10-70 Troubleshooting
If the camera is still taking low quality pictures after you have cleaned the camera lens, you should think about replacing your tablet camera. The link to the repair guide for the Lenovo Tab 2 A10-70 will be available soon. Link to Troubleshooting: Lenovo TAB 2 A10-70 Troubleshooting