Yes, face it. THERE IS NO MEGABASS! And there will NEVER be. It cannot be flashed via firmware. Either it has the capability by hardware or it doesn't. Sony has splited very clearly to have the K series to now carry the Cybershot branding. This makes it a camera oriented phone. While on the W series, the walkman phones will carry the Megabass capability.
This is quite sad. To believe K750i has it and this comes to a downgrade. At least by specs anyway. But the good news is that, the bass is actually pretty strong on its own. So I am not saying the sound is like shit. In fact, I think its pretty good enough on its own. But it does not carry the Megabass logo kinda disturb me thats all.