I hope I was clear in the thread title. Here's my problem:

I just got a Jailbroken iPhone for T-Mobile. Everything is working fine, but there is unwanted music on the phone. I want to get rid of the music and put my own music but the music is grayed out and will not let me delete it. I cannot add any music either. I get a message saying:

"The iPhone "King" is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?

An iPhone can be synced with only one iTunes library at a time. Erasing and syncing replaces the contents of this iPhone with the contents of this iTunes library"

Should I "Erase and Sync" the iPhone?

I'm afraid of doing this because I don't want the software to update and lock me out of the phone... ANY HELP IS APPRECIATED! THANKS!