I have encountered a problem when attempting to update the firmware in the Intel Management Engine. The firmware update is posted on the W520 driver page (it is package 83rf32ww). The problem is the error message shown in the photo below.
The update process starts when the MEUpdate.CMD file is selected within the DOS window, but after a few seconds, the error message at the bottom of the picture appears.
Issue happens when you are running it from C:\Windows\system32 rather than the expected C:\DRIVERS\WIN\ME.
Follow step provided below to install the Intel ME correctly.
Double click on the 83rf32ww.exe file
It will extract to folder C:\DRIVERS\WIN\ME
Click Start, type "CMD"
Right Click and select "Run as Adminstrator" on CMD