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Hi, xferdata() is Cypress provided API available in Cyusb.dll or Cyapi.lib whereas IOCTL_EZUSB_BULK_READ makes direct call to the driver ezusb.sys. IOCTL_EZUSB_BULK_READ uses old driver ezusb.sys which we don't support anymore. xferdata() uses new driver cyusb.sys. Please find the attached figure for more details.