generally regard it as the "gold standard" for internal device manipulation, though it comes with a steep learning curve: Band Unlocking
The Qualcomm eXtensible Diagnostic Monitor () is a professional-grade diagnostic tool used primarily by engineers to monitor and troubleshoot wireless communication on devices powered by Qualcomm chipsets. While it is a proprietary industry tool, it has gained significant recognition within the XDA Developers community as a powerful "hacky" method for advanced device modification, such as unlocking network frequency bands. Role in Professional Engineering qxdm xda