Windows 11 includes enhanced security features that sometimes block older drivers like those for the
Microsoft hosts a generic CCID driver that supports the Ez100pu’s USB Vendor ID (VID_076B) and Product ID (PID_3021).
Right-click it, select , and choose Search automatically or Browse my computer if you have already downloaded the files. Fixing Recognition Issues on Windows 11 Ez100pu Driver Windows 11
Yes, but it often requires manual intervention.
The reader appears in Device Manager, but inserting a card produces no response or the companion software cannot communicate with the reader. The reader appears in Device Manager, but inserting
Open the , type Core Isolation , and open the system settings page. Locate the Memory Integrity toggle switch. Turn the switch Off . Restart your computer to allow the driver to load. 3. Use a USB 2.0 Port
Open Device Manager and expand Smart card readers . It should cleanly display "EZ100PU Smart Card Reader" or "Microsoft Usbccid Smartcard Reader" without any warning symbols. Turn the switch Off
For users who rely on smart card authentication regularly or who have strict security requirements, upgrading to a modern CCID-compliant smart card reader is strongly recommended. These devices:
The EZ100PU, manufactured by Castles Technology (虹堡科技), is a USB-connected smart card reader widely used for reading National Health Insurance (NHI) cards, digital certificates, ATM cards, and other IC chip-based identification documents. Its popularity stems from its simplicity, reliability, and broad compatibility with various government and financial service platforms.
Unfortunately, the EZ100PU's existing drivers were not designed with Windows 11's Memory Integrity feature in mind. The 64-bit driver ( ezusb64.sys in particular) relies on a legacy driver architecture that is incompatible with the new security standards. When Memory Integrity is enabled, Windows actively blocks these incompatible drivers from loading, which prevents the smart card reader from functioning properly.
If successful, your reader will show up without errors. Test it with your smart card software.