registry key has been noted as a working fix for smart card readers disabled by recent Windows 11 updates. Driver Sources Microsoft Update Catalog:
If the automatic setup fails, you can force Windows 11 to use the specific driver files. ez100pu smart card reader driver windows 11 better
If Windows 11 refuses to install the driver because it isn't digitally signed, you may need to disable "Driver Signature Enforcement" via Advanced Startup settings. EZ100PU Smart Card Reader driver — Windows 11
Some users have reported issues with the EZ100PU Smart Card Reader driver on Windows 11, including: Go to Castles Technology official support → EZ100PU
If the device still isn't recognized, follow these steps to manually install the driver:
Go to www.ez100pu.com (official) or identiv.com (they acquired Ezus).
Newer Windows 11 versions enforce "Core Isolation," which blocks the EZ100PU's older, unsigned, or incompatible drivers.