Can you try https://map.atownsend.org.uk/maps/mkgmap_maps/ajt02/iran/ajt02_iran_supp.img ? I suspect that you’ll get an error that says “Can't Authenticate Maps. Contact content seller for help.
”.
If you don’t get that error, look at the resources here and search the sites listed for “Unicode”. If someone offers “unicode maps”, try those.
If you do get that message, try acknowledging the message and seeing if the maps work anyway. If not you are likely out of luck for these maps on that device in Iran, unless you could translate Persian text to some sort of “ascii compatible soundalike”. If you want to explore that route, the answers here might help you.