eS 128 Splash screen

I tried unsuccessfully to install a custom splash screen for my eS128 MFD.  The title of the forum post for custom splash screens indicates the eS series can have a custom splash, but when I look at the pdf instructions, the eS series is not listed.  I did follow the instructions for the E series MFDs, but it did not work.  I did install both scripts and a 1280 x 800 pixel .png image in a blank micro card, and named the png file OEM_E12_splash.png    Please advise.
thanks,
Jack