We have a new iOS 11.x bug to remove Mobile Device Management profile from any iPhone, iPad and iPod. This new method will completely remove any remote management profile from a local device.
iOS 11.03 allows you to bypass iCloud completely, but only for devices in Clean mode, with passcode option. This bug happens on iCloud lock activation screen, before you activate your device.
First of all need to understand that iCloud Lock it just device link to exact Apple ID. And once Apple ID owner remove his device from iCloud account, it immediately become unlocked. This makes you understand that the best and easiest way to remove iCloud Lock is contacting with owner, and ask him to remove device from his account.