Tecno W5 is an Android based application which means that you have to use the hardware buttons in order to unlock it since this procedure can't be done in another way.
Here are the instructions available:
- Switch off the device
- Hold the POWER key together with DOwn volume key to power the phone and start the resetting process.
- Use the up/down volume keys to scroll screen and use the Power key to select and confirm.
- Select WIPE DATA and the phone reboots after some few minutes to clear and reset your device memory.
Additionally, visit a local phone service shop to unlock the phone without wiping the data on your mobile phone.