Related על מגילה 2:2

[If the Megillah] was read in a foreign language (specifically Greek, see Jastrow (לעז)), the foreign-speakers fulfilled their obligation. [If] it was read in Assyrian, those that heard it and those that did not hear it fulfilled their obligation. In any case, they do not fulfill their obligation unless it is written in Assyrian with Hebrew letters on a scroll, and with ink.