The "2335" typically refers to the USB Product ID (PID) for ZKTeco fingerprint readers (like the ZK4500, ZK9500, or SLK20R). If your computer sees the device as "Unknown" or "USB\VID_1B55&PID_2335," you need the ZKFinger SDK drivers to make it work. 1. Where to Download the Drivers The safest and "better" way is to use the official ZKTeco Download Center

Reopen to verify that Biometric Devices -> ZKTeco Fingerprint Scanner shows up clearly without any errors. Troubleshooting Common Connection Failures

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If your goal is to extract attendance data rather than just installing a driver, ZKTeco devices support several methods: ZKFinger SDK for Windows - ZKTeco