Select the "Choose File" button and point it to the free LSW-3 firmware you downloaded.
However, manufacturers like Siemens often host firmware on restricted portals (e.g., the Siemens Industry Online Support – SIOS). You may need a free account or an active service agreement to download it. The keyword in your search usually means: lsw3 firmware free
: If you have a business account, you can often push firmware updates remotely. However, users frequently find the "Select Firmware Package" list empty unless a manufacturer has specifically assigned a version to their logger serial number. Select the "Choose File" button and point it