Updated |link|: Pnp0500 Driver
Here’s a step-by-step guide for updating the PNP0500 driver (typically associated with a COM port / serial device or an internal communication port in Windows).
: The driver supports power-saving states, placing the port in a low-power mode when not in use and waking it for incoming data (e.g., wake-on-ring). Microsoft Learn Driver Updates and Troubleshooting pnp0500 driver updated
If that fails, delete these registry keys (backup first): Here’s a step-by-step guide for updating the PNP0500
2. Root Cause Analysis
- Driver Corruption: The default Windows serial driver (
C:\Windows\System32\drivers\serial.sys) becomes unregistered or digitally unsigned due to third-party software. - Registry Key Deletion: Installation cleaners sometimes remove the
LowerFiltersorUpperFiltersrequired for the legacy COM port. - Resource Conflict: Another device (often a Bluetooth COM port or a virtual machine serial pipe) has claimed the same IRQ/IO range.
Right-click on Communications Port (PNP0500) and select Update driver. Choose "Search automatically for drivers." Driver Corruption: The default Windows serial driver (
Check under Driver updates for anything mentioning "System," "Communications," or "Chipset."