I tried the EZ Reader Basic version, see
New firmware and it was a bit different from the earlier ADE firmware (both are standard Jinke firmware, with EZ Reader splash screens, so far as I know).
The PDF font sizes had changed. Now font size 4 is the old font size 3, and font size 5 is smaller than the old font size 4. I did not have much problem with the original PDF sizes, which were better than the ePub sizes.