The code you speak of would have to have been setup by you or the previous owner, and I can tell you, it is not an easy thing to do. Most likely nothing will happen if you disconnect the battery. Also, mostly this problem is only present with factory head units, and I would assume if you are...
Short answer, no.
Long answer. Unless you have solar panels there is no way to convert the energy, yet if you did have a solar panel, there would be no need for an app as the panel converts the energy for you, but at the rate which it would convert the energy it would be so slow since the...
this is going to get complicated....
technically you didn't write over the information, it just isn't being seen since the session was probably closed without adding this information, which makes it look like only the new information is there.
So, what you are going to need is a program that...