hi, iPhone 6S, never been plugged to a computer. My friend tried to update iOS and something went wrong so the iPhone is now 'bricked' (?) with that iTunes sign which means you have to plug it to a computer to update the version. Considering she never plugged it to any computer and made no backup, will it earase the iPhone once updated through a computer or will it keep all the data? Also, if I'm plugging it to my computer that has a different Apple ID signed to it (than the one she entered on the iPhone App Store), will it cause further damage?