This is inferred from two references: "... an anonymous early 9th century Kashmiri Hindu king ..." wrote a letter to Amir Abdullah bin Umar bin Abdul Aziz of Mansura, requesting him to dispatch a scholar to his court who could explain the tenets of the Islamic shariah in the language "al-Hindia".
[4] The 9th-century Persian traveller Buzurg bin Shahryar mentions in his travelogue, Ajaib-ul Hind [The Wonders of India], that the Hindu king of Mehroke in Kashmir had commissioned the preparation of a Kashmiri translation of the Quran.
Same Sufis had earlier created "Shah Mukhi" script by combining Arabic and Persian alphabets later translated into various other languages including English.
His work has also been translated into several languages, including English, Persian, Arabic, Turkish, French Etc.
Although never schooled formally, the University of Montreal, Canada, had conferred on him an honorary degree of doctorate, in acknowledgement of his work.