Unknown device under Universal serial bus controller - HP Support Community - 8094446
HP FutureSmart Firmware Devices - 99.09.XX Errors - Tech Tip
Solved: HP ENVY 7640 Drivers not installing - HP Support Community - 6015897
Solved: unknown device - HP Support Community - 7788200
HP DeskJet 3755 Print Scan Copy Web All-in-One Printer Ink Unknown Level 889899112717 | eBay
Solved: PCI and unknown device driver update - HP Support Community - 8090768
Fix Device Descriptor Request Failed (Unknown USB device)
Solved: Fix for Unknown USB Device (Device Descriptor Request Failed... - HP Support Community - 5973953
HP OfficeJet J4580 All-In-One Inkjet Printer UNKNOWN IF IT PRINTS NO INK TO TEST 883585633531 | eBay
HP OfficeJet 4650 All-in-One Printer Software and Driver Downloads | HP® Customer Support
How to Fix HP “Printer Status Unknown” Error
Solved: Unknown devices in Windows 7 device manager - dv7-2170us - HP Support Community - 220228
HP Notebooks, Desktops, Mobile Workstations PCs - Device Manager Displays an Exclamation Mark (Yellow Bang) on Unknown Device: ACPI\HPIC000C | HP® Customer Support