Hello i reverted the firmware to 1.2...conclusion, is awsome...i had the 1Z with the 1.2 in the past and when i bought it again i felt like the 2.0 had removed some of the magic that the 1Z had (in my opinion of course) the 3.0 i have mixed feelings, i thing is the mix of the1.2 and 2.0 , it is more organic than the 2.0 but not so much like the 1.2 but rewards you with space and air, both 2.0 and 3.0 are less thick and warm than the sp1000cu ,the sp1000 has a little more bass, with 1.2 the1Z is a bass master...wonderfull, the only thing that bothers me is a error warning saying to press 8 seconds blablabla every time i go to settings, i don't know how to make to that dissapear