Hi. To hard reset your Huawei Y300
1. Turn the phone off, and pull the battery out and reinsert after a couple of seconds
2. Press and hold both the Volume Up key and the Power key at the same time - continue holding until a recovery menu displays.
3. Scroll with Volume Down key and highlight Wipe data/factory reset
4. Select or confirm with the Power button or the Vol Up button
5. Scroll to Yes - wipe all user data
6. Corfim with the Power button or the Volume Up
7. Confirm 'Reboot Now"
The Huawei Y300 should be reset now.