This is something I discovered while restoring my iPhone 6+. Before the restore my iPhone 6+ was jailbroken with the EU volume uncapped. After restoring my iPhone 6+ and restoring backup to my happy surprise I noticed my iPhone 6+ volume was still uncapped even without a jailbreak. Here is instructions how to do it. First you will need to jailbreak iPhone/iPod Touch to install iFile to change the settings to uncap device. On iFile go to /var/mobile/library/preferences/com.apple.celestial.plist% and go to headphonesand change to 1. Now the idevice will be uncapped and best still the settings will be saved on the backup in iTunes. So this means the iPhone/iPod Touch doesn't need to be jailbroken to enjoy the uncapped volume. All you need is the backup from iTunes to uncap from the dreaded EU volume cap. I hope this is okay to post. If it is not then remove it.