hi guys, i got the same unit from the same guy with all the same problems, firstly it would not read the SD card, then a week later it worked out of the blue it just decided to work, then it wasn't receiving a signal, had to open it up and found the installer didn't connect the receiver to the back of the unit so after i corrected that mistake i found out that i have to manually search for the GPS signal every time i want to use it, then it works great. secondly, it doesn't fit perfectly as you say it pushed my air con unit a little up and a gap on the bottom. and thirdly, my buttons on the steering wheel don't work properly, when you press the volume down nothing happens but press the volume up and the volume goes down, the only thing that does work is the up/down scroll buttons. the only good thing about the whole unit is the way it lights up at night so its occurred to me maybe that's why it was so cheap.