My phone's gotten really slow lately. I'm considering restoring the OS and starting over again because I've been experimenting with stuff I barely need lately. How would I go about doing the absolute freshest install I possibly can? No, I don't want things to re-download or anything. I want to set it all back up like before. It's not really that hard to do, after all! The only thing I'd like to backup is my contacts if that's possible, but if it's not possible to back JUST that up and nothing else, I'll re-input them manually, I only have around 50 so it won't take me too long. Thanks in advance!