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Eric PetersonAug 5, 2025
How to fix the issue when I cannot install cyusb3.sys driver for Cypress Microcontrollers?
- WWilliam VelezAug 5, 2025
If you're having trouble installing the cyusb3.sys driver for your Cypress FX3 Microcontroller, there are a couple of potential reasons: * Older FX3 SDK versions (prior to 1.1.1) contain unsigned USB drivers. To use these, reboot your PC, press F8 during startup, and select 'Disable Driver Signature enforcement'. * Ensure you are using the correct SuiteUSB installer for your operating system. Use CyUSB3_x86_.msi for 32-bit Windows XP/Vista/7 and CyUSB3_x64__..msi for 64-bit OS platforms. You may need to perform manual driver re-binding as described in section 3.4.1 using the Windows Hardware Wizard.
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