Hi,
I follow the tutorial here (See link below) in order to print Arabic characters on a ZT420 printer. But unfortunately I cannot make it work. I am having ?????? printed

Zebra Technologies - Unicode Printing using the free Swiss 721 Font for Zebra ZPL Printers

Printer: ZT 420 (V75.19.7z firmware version)

Can you please help if someone have an idea.

Thanks