In order to reset either of these two errors: 5200 or P08, follow these steps.
Your printer should have the power cable connected but it should be turned off.
When you see the Power LED on , press “Stop/Reset” twice while the “Power” button is still pressed.
Take your finger from both buttons, “Power” and “Stop/Reset”, and wait around 30 seconds until you should see on the display this character: “o”.
Press “Stop/Reset”, four times.
Finally, press the “Power” button twice and them turn the printer off.
Open the printer. Either of the mentioned errors won’t occur at this point.