The UN2420 is a "loader" card, meaning it needs a few seconds after boot-up to load its firmware before it appears in your network list. Your specific HP laptop model (e.g., EliteBook 8440p).

The Gobi 2000 requires a to load firmware.

If the installer fails to run, right-click the setup .exe file, go to Properties > Compatibility , and select Windows 7 . Alternatives for Missing Drivers

or sp51022.exe). Run the file to extract it; it typically saves files to C:\SWSetup\spXXXXX Open Device Manager

The HP UN2420 Mobile Broadband Module is a Qualcomm Gobi 2000-based cellular modem. It allows older HP EliteBook and ProBook laptops to connect to 3G networks.

Even after a "successful" install, Windows 10 can sometimes be stubborn:

When you install Windows 10 on an older HP laptop, the operating system's built-in plug-and-play architecture cannot correctly parse the un2420 module firmware. This breakdown results in several common system errors:

If your device fails to start after setup, it is typically because the firmware failed to load onto the chip at boot time.

Right-click the Windows Start button and select . Scroll down and expand the Network adapters section. Look for HP UN2420 Mobile Broadband Module .

The keyword "upd" in your search likely refers to the HP Universal Printer Driver or, more likely in this context, a specific firmware or driver update package. However, installing this driver on Windows 10 is notoriously difficult.

Legacy drivers can occasionally conflict with Windows 10 power management features.