Can I change DVD region?
I recently bought a PS3 Slim 120GB and it came with DVD region 3, but mine is 4. Is it possible to turn region 4?
Software or hardware solution?
No there isn't but there is no restriction for game play on PS3 but you won't be able to play DVDs from other region if its region coded, but there is always a room for ripping & copying
From what I remember, the PS3 is region-free in almost all cases. You should have no problem with the DVD region.