Rep Power: 0

I want to put all the settings on my Pioneer DEH-P5500MP back to what they were when I got the HU (thought I could figure out the fine tune but ended up playing a little too much and now want it back how it was before). How do I do this, just unplug the (-) terminal on my battery or is there a fuse or even a button combo you can put in? Please someone let me know how to do this. Thats a lot!

 
Rep Power: 329

remove the + wire from the battery terminal and that will do it. disconnect the harness ont the back of the head unit and the reconnect it and that will do it as well (won't reset the ECU).