M550 (COM4) Driver

The M550 (COM4) driver helps Windows communicate with the Ptytrade USB device identified as M550 on the COM4 port. You may need it when setting up the device for the first time, reinstalling Windows, or troubleshooting a missing or unrecognized connection in Device Manager.

Key Features

• USB device recognition: Helps Windows identify the connected M550 so compatible software can access it.
• COM-port communication: Supports communication through the device’s assigned port, shown here as COM4. The port number may change if Windows assigns a different one.
• Support for listed Windows versions: The device is listed for Windows 10, 8.1, 7, Vista, and XP; choose a package that specifically matches your system.
• Driver maintenance: Installing a suitable replacement can help resolve problems caused by a missing, damaged, or incompatible driver.

How to Install M550 (COM4) Driver

1. Check your Windows version and architecture. Confirm whether your system is 32-bit or 64-bit before choosing a package. For Windows 10/11 systems, note that Windows 10 is listed as supported, but Windows 11 compatibility has not been confirmed.
2. Verify the device details. Open Device Manager and locate M550 (COM4), or check under “Ports (COM & LPT)” and “Other devices.” Compare its hardware IDs with those supported by the driver package.
3. Select a compatible package. Before starting your M550 (COM4) driver download for Windows, review the supported operating systems and source. If a free download is offered, make sure it is the actual driver package rather than an unrelated installer.
4. Install the driver. If the package includes a setup program, follow its instructions. Otherwise, extract the files, right-click the device in Device Manager, select “Update driver,” and browse to the extracted driver folder.
5. Confirm the connection. Restart Windows if prompted, then check that the device appears without a warning icon. If your software requires a specific COM port, select the port currently assigned to the M550.

Keep a copy of your working driver before applying an update. Choose the latest version that explicitly supports your hardware and operating system—not simply the newest package available—and review any release notes to see whether the update addresses your needs.