The method of using a "firmware update filter driver", is recommended for devices that have enough resources to hold two full firmware images (the update image and a backup image) on the device memory. The device will be re-enumerated with new firmware. On completion of flashing the firmware, the device must disconnect and reconnect to the bus. Nx216 flash reader usb device driver drivers#KMDF based firmware update drivers can send the vendor specific commands to perform the firmware update. Nx216 flash reader usb device driver driver#For example, the UMDF based filter driver for a camera would use Camera APIs to perform the firmware update. UMDF based firmware update drivers can use the device specific APIs or issue the control transfers directly to access the USB device to perform the firmware update. On receiving the notification, the filter driver should post a work-item that would perform the firmware update. The firmware update filter driver for a RGB camera would register for KSCATEGORY_VIDEO_CAMERA. When the EVT_WDF_DEVICE_D0_ENTRY callback of the WDF filter driver is called at a later point, the filter driver must register for device interface change notifications using CM_Register_Notification or IoRegisterPlugPlayNotification (UMDF or KMDF) to listen to the device interface class the USB device will register the device into.
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