[Gorit]

Solved.

Steps:

1. Create a new folder named fonts in eReader
2. Copy times*.ttf from Windows\fonts to eReader's fonts
3. Use Calibre to retouch --> expand the ePub.
4. Add the following at the beginning of stylesheet.css:
   @font-face {
   font-family: 'Times New Roman';
   font-weight: normal;
   font-style: normal;
   src: url(res:///Data/fonts/times.ttf);
   }
   @font-face {
   font-family: 'Times New Roman';
   font-weight: normal;
   font-style: italic;
   src: url(res:///Data/fonts/timesi.ttf);
   }
   @font-face {
   font-family: 'Times New Roman';
   font-weight: bold;
   font-style: normal;
   src: url(res:///Data/fonts/timesbd.ttf);
   }
   @font-face {
   font-family: 'Times New Roman';
   font-weight: bold;
   font-style: italic;
   src: url(res:///Data/fonts/timesbi.ttf);
   }
   Make sure 'Times New Roman' is used across the styles in stylesheet.css. For instance:
   .calibre16 {
   font-family: 'Times New Roman';
   font-size: 1em
   }
   and NOT
   .calibre16 {
   font-family: Times New Roman;
   font-size: 1em
   }
   (Did you see the ' ?)
5. Rebuild, download y ya está!