1: Try to upgrade directly from TIA Portal
2: If image files are missing then:
> Download the image files in this link
> Insert these files at the Siemens installation folder (e.g. "C:\ProgramFiles\Siemens\Automation\PortalV16\Data\HMI\Transfer\16\Images" and try to upgrade again from TIA Portal
3: If still not successful, use the Siemens software ProSave. Select the device model (e.g. TP700 Comfort), connect to the device via Profinet, then perform a device Backup and check the compatibility of the version clicking at "Device status" button (OS update Tab), before upgrading the OS version
4: If still not successful, try to use a USB stick that contains the correct image file (*.fwf) and plug directly the USB to the HMI. Then upgrade from the HMI
It is good practice to use the latest firmware version available.
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