Nexus Root Toolkit is an application designed for the Nexus series of Samsung smart phones. Its purpose is to unlock, root and relock devices, as well as flash stock Android releases. All of these operations cause complete data loss, and as such, Nexus Root Toolkit also provides possibilities to backup content prior to performing any change. Requirements include owning a Nexus device and a great deal of knowledge about the above mentioned terms. If this is your first time unlocking and rooting an Android phone, we warmly suggest that you prepare thoroughly (there are plenty of explanations and tutorials on the Internet).