I'm having the same problem because I did not update the firware. Either your cousin was lazy, couldn't understand the walkthrough, or had problems like I am going through.
I don't think he ripped you off. But if he did, is he within arm's reach? 
I get the same notifications from time to time; more often than others. Can you print? If so, how far can you get through before it fails?
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!