The file name should look like Medianav_10.1.3_Full_NA.zip (NA = North America) or EU_10.1.3 . You need the FULL update, not an incremental patch.
The Diagnostique Diaries Reading time: 8 minutes upgrade medianav 913 to 10131
Only then could they enjoy the 10.13.1 firmware and the modern connectivity they craved. The file name should look like Medianav_10