Odds are he's referring to either Knife trick or the Credit Card swiping trick..
Either one of these WILL shorten the life span of the PS2..
Don't bother..Get yourself a Modchip..
And there is NO BOOTDISC..Despite all the crap you might here about..Maybe someday but not Today or Tomorrow unless Super miracle happens..
Seriously though Modchip is the BEST investment you'll make and later you can laugh at your friend when he's machine is damaged or DEAD. Get a Pro solderer to install it..Magic2 is 100% non Swap..All Direct Boot including Imports.
Now that MAgic2 is all 7 PS2 compatible..