Before troubleshooting further, please note the hardware limitations of the un2420 module:
If you are looking for "upd" specifically, be aware that many driver download pages bundle the un2420 driver with HP Universal Printer Drivers or hotkey utilities. This creates "bloat." A clean install requires strictly the broadband driver and the Connection Manager software, skipping the unnecessary printer drivers often bundled in the executable. hp un2420 mobile broadband module driver windows 10 upd
All INF files are in the same amd64 folder. Click to let Windows find and install the driver files
Click to let Windows find and install the driver files. Troubleshooting Common Issues Getting the HP un2420 Mobile Broadband Module Working
) to work on can be a bit of a puzzle. Because this hardware was designed for older laptops like the EliteBook 8440p or ProBook 6550b, HP never released an "official" Windows 10 driver for it.
Getting the HP un2420 Mobile Broadband Module Working on Windows 10