I got the Memo Pad FHD 10: It lagged in slowness a bit in a few well known apps. Also when browsing the internet. Also the kicker for knowing I had to 'Root' was certain apps use the 'System font' for Chinese-Pinyin display. Asus-Memo Factory-font does not display accented characters well. But the standard setting do not allow adjustment to the System-font.
Your Easy instructions under: 'For those who are not rooted'... Were simple. I downloaded the two files... 5.0.16 (Although: Note I needed to rename, the 5.016, to exactly match what you said. The filename was slightly different.)
I was a little scared, even though I had already upgraded the firmware of my Tablet to 51.31, but another poster had that number as well, so I decided to boldly press-on.
Then I put the 5.017 and boom... and installed the SuperSU file as instructed... and a way I went! Thanx! Thankx! I put on HiFonts and found a font that was suitable for the system. The pad is also now so much snappier!!! I hope that doesn't mean the battery is now going to drain at an alarming rate. I haven't tested that yet. :