Instead, you need to download the from the manufacturer. This will install cyusb3.sys along with its supporting files correctly. Where to Safely Download the Driver The driver is part of Cypress/Infineon's "SuiteUSB 3.0" or the "EZ-USB FX3 SDK" .

cyusb3.sys is a core system driver file for Cypress (now Infineon) FX3 USB 3.0 SuperSpeed controllers . You cannot (and should not) download this single .sys file alone from a "DLL download" website. Those sites often distribute outdated, incorrect, or malware-infected files.

Infineon (Cypress) Developer Community

Cyusb3.sys Driver Download May 2026

Instead, you need to download the from the manufacturer. This will install cyusb3.sys along with its supporting files correctly. Where to Safely Download the Driver The driver is part of Cypress/Infineon's "SuiteUSB 3.0" or the "EZ-USB FX3 SDK" .

cyusb3.sys is a core system driver file for Cypress (now Infineon) FX3 USB 3.0 SuperSpeed controllers . You cannot (and should not) download this single .sys file alone from a "DLL download" website. Those sites often distribute outdated, incorrect, or malware-infected files. cyusb3.sys driver download

Infineon (Cypress) Developer Community

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