Quicker to phone Sony and get a refurb.
The retailer might not be interested, even though your contract is with them.
Up to 6 months, it can be seen as faulty as sold, over 6 months old, you're at their discretion as to how they sort it.
The may offer a repair, or replacement(refurb possibly), but with Sony, if it's under a year old, you will get one by the weekend possibly, if you call them quick.
It's a corruption, and can be caused with faulty drives, connection to headsets, connecting to amps, etc..sometimes you can get the database fixed, other times you can't.
Dropping it as well, could break it..drink and gaming, well..don't lend stuff like that to friends..
I think your friend has done more than he's let on, TBH.