For this you will need:

Step 1.

The first step is to unzip the contents of the firmware onto the blank, formatted USB stick. Once you've completed this, the USB should be organised as so:

Step 2.

While the printer is turned OFF, insert the USB stick into the right-hand-side of the printer.

Step 3.

Switch the printer ON, and click the black button on the front to wake it up. After a few seconds, the printer should boot into the updating screen as so:

Step 4.

Once the update has completed you'll be presented with the following screen. Please turn the printer OFF once more, and remove the USB stick from the right-hand-side.

Step 5.

Switch the printer back ON, and click the black button on the front to wake it up. Navigate to 'Tools' > 'About' and check that the firmware version matches the version you just attempted to install.