In order to hard reset a VK Mobile VK300, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
VK Mobile VK300 device will be brought back to the default configuration of a brand new device.
1. Start by powering up the phone.
2. Now enter one of these codes: 85558555# , 4268#* , *#27#. Hold the # for 3 seconds.
3. Lastly, wait for the phone to reset and restart. Voila, done.