You’ve resurrected a thread on the old forum from 8 years ago, but you’re going to need to provide a bit more information about what you actually want (such as what Garmin device you actually have and where you want a map of) before anyone can answer.
I answered a similar question (about Persian text) here and suspect that you’ll get the same issues with Arabic. Unfortunately this wiki page no longer mentions Unicode, so I don’t know where advice there to someone who wants an Arabic map is.