Windows Phone Internals is a tool that helps to gain root access on Lumia devices. Windows Phone Internals essentially automates the processes required to unlock the bootloader on any Lumia device, disabling security features and allowing you to gain root access. Once you've achieved root access, your device is completely unlocked, allowing you to flash custom ROMs, create full device backups, or even use your Lumia in Mass Storage Mode. The tool also potentially opens the door for developers to cook up other cool hacks for Lumia devices.In short, this update potentially breathes new life into a segment of devices that is not a focus for Microsoft anymore. If you're willing to tinker with your Lumia, you can download Windows Phone Internals version 2.3 now.