Thank you all, I'll try to work on it adjusting the pickups (i prefer not to mess around with eq as I wish it to play properly without any special external adjustments)
And yes, I've been thinking to sell it out, let's see; I love this guitar as it has an amazing colour and finish, I really love it and yes, I should have asked before buying online and I do agree that a guitar should be played before buying it; it was a great price and I really thought that, even if new and not an old one, it should have sounded not 100% like my '96 one but quite similar: actually the gibson sounds as a superstrat with lots of high frequencies :-(
Not on this model the DIP switch unfortunately :-(
Anyway, thank you all for your help. Always accept new advices!