Can you share what you were sending?
I'm sending the 77849_002.ZSU file after I extracted the files from zip file. I sent this command and this is what I got:
- DIR E:*.*
* E:TT0003M_.FNT 169304
- 5711168 bytes free E: ONBOARD FLASH
but I print I still get non Arabic characters.
Have you tried the example in Unicode Printing using the free Swiss 721 Font for Zebra ZPL Printers? Did you get the same results as shown in the example? If you get the same results for Arabic as shown above but could not get the arabic characters printed out by your ZPL, then we need to look at the ZPL you used to print your label.