Please follow the steps below. These steps will not delete any data on the phone as it refreshes the device memory by deleting the temporary files on the phone.
1. Power the device off (remove and re-insert the battery).
2. Press and hold the Volume Up key, then press and hold the Power key.
3. When the device vibrates; release only the Power key.
4. When the Android system recovery menu displays; release the Volume Up key.
5. Navigate with the Volume keys to the wipe cache partition option and press the Power key to select.
6. While the reboot system now is selected, press the Power key to reboot the phone.
1. Power the device off (remove and re-insert the battery).
2. Press and hold the Volume Up key, then press and hold the Power key.
3. When the device vibrates; release only the Power key.
4. When the Android system recovery menu displays; release the Volume Up key.
5. Navigate with the Volume keys to the wipe cache partition option and press the Power key to select.
6. While the reboot system now is selected, press the Power key to reboot the phone.