ZT230 UTF-8 Problem with installed Swiss 721 font

Hello, I am experiencing problems with printing unicode UTF-8 characters in a new ZT230 printer.

- I have downloaded swiss 721 font to printer.

- Checked that the font is in E:TT0003M_.TTF

- Trying to print Greek chars from the Zebra Unicode example with the following:

^XA^LRN^CI0^XZ

^XA^CWZ,E:TT0003M_.TTF^FS^XZ

^XA

^FO010,470^CI28^AZN,50,40^FD- Swiss 721 Greek: ΆΈΉΊΌΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩΪΫ^FS

^XZ

fails with no characters printing in Greek (prints only - Swiss 721 Greek:)

-All examples with UTF-8 encoded ZPL from Zebra site are failing, printing UTF-8 chars as ????

(in the case of Greek it prints nothing at all)

Do you have any hints or could you elaborate on what is wrong?