Do take note that by factory resetting your Lumia 535, you will be erasing the settings that you have made on it, the data and as well as the apps that you have downloaded.
On that note, let’s get started.
You will have to switch off your Lumia 535
After switching it off, press and hold the volume down button and at the same time, connect the charger.
And when you see the exclamation mark on the screen, immediately release the volume down button.
Next, press the following buttons in the exact sequence written below
Volume up button, volume down button, power button and volume down button.
After you have completed the above, your Lumia 535 will reset and begin rebooting.