[Composite USB Connection (VID_04E8)] │ ├──► Media Transfer Protocol (MTP) --> File Browsing & Storage ├──► Android Debug Bridge (ADB) --> App Debugging & Shell Access └──► Modem Interface (MSS Ver. 3) --> ssudmdm.sys (Tethering / Flashing) Primary Use Cases for the Driver

If you install Samsung Smart Switch for backups, it automatically bundles the latest verified drivers, including the Modem Ver.3 component.

Required for developers to debug apps over a USB connection. ⚠️ Common Issue: Windows 11 Memory Integrity

When you connect a Samsung device to a Windows PC via USB, it relies on a suite of drivers to perform different functions. While MTP (Media Transfer Protocol) handles file transfers, the modem driver is what manages:

Samsung’s MSS Ver.3 driver introduces several optimizations over earlier versions (MSS Ver.2 found in Galaxy S9/S10 era):

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Look for the published name associated with Samsung (often listed as oemXX.inf ).

: Facilitates connection during Download Mode , which is required for firmware updates or manual system recovery using tools like Odin . Technical Specifications

The Samsung USB Composite Device Driver, which organizes the device’s individual endpoints (ADB, MTP, and Modem).

The MSS Ver. 3 tag specifically denotes a Modem Subsystem interface version used in Samsung's driver architecture. It enables Windows to parse AT commands (the language modems use) to your phone. Why Do You Need It?

Samsung USB Composite Device Driver (MSS Ver.3) is a component of the Samsung Android USB Driver