I'm sure this will seem like a really stupid question to most of you, but I haven't found a definitive answer for it. My girlfriend and I just got S5's yesterday, and the first thing I did after activating mine was root it. Unfortunately they came with 4.4.4 so towelroot wouldn't work without flashing an older firmware first, which I did. I plan on doing the same with hers. My question is, does flashing a firmware wipe everything? I couldn't tell since mine was stock to begin with. My girlfriend spent all day setting it up the way she wanted it and would be pissed if she lost everything she did. Like I said it's probably a stupid question, but I appreciate a definitive answer.