To provide more specific details about this "v3.0" tool, please clarify the (e.g., Qualcomm Flash Image Loader (QPST), Qualcomm Special Tool, or a specific community-made utility).
If you are looking for the features of a v3.0 release for common Snapdragon utility tools (often referred to as "Qualcomm Flash Tools" or "Qualcomm Unlock Tools"), they generally include the following capabilities:
: Support for flashing standard XML-based firmware packages (rawprogram0.xml and patch0.xml). Diagnostic and Repair Capabilities
Install Product Configuration Assistant Tool (PCAT) - Qualcomm Docs
: The ability to enable Diagnostic (Diag) ports to interface with professional testing software. Development and Official Tooling