E173 updating firmware inserted is not firmware
The co-installer kick starts the firmware update process.
The absence of co-installers on Windows 10 prevents device vendors from updating the firmware on these devices in the field.
On receiving the notification, the filter driver should post a work-item that would 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.
For example, the UMDF based filter driver for a camera would use Camera APIs to perform the firmware update.
KMDF based firmware update drivers can send the vendor specific commands to perform the firmware update.
When a USB device is plugged in to the system, the generic inbox driver is installed for the device.
After the installation of the generic driver, the OS queries the Windows Update server for any vendor specific driver package availability and downloads it and installs the driver.
For other FAQs about Troubleshooting, please see the "Questions and Answers" section on the Sony Support Site.
Once you've downloaded the update file and prepared your USB device, you can install it on your TV.
The process can take up to 10 minutes and during the installation your TV will turn off before turning itself back on.
One thing that is common to all existing update mechanism is that some custom software suite runs on the client and downloads the firmware to the device.
Typically, as part of the device installation process, the firmware updating software suite is installed.