That model appears to be for the Japanese market and only comes in Japanese language. You could try contacting Clarion to see if there is a firmware update.
https://forum.xda-developers.com/t/hack-a-car-radio-clarion-c9cd-v6-650.4038443/
https://www.mazdaforum.com/forum/mazda-mpv-17/clarion-c9cd-44849/
https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk00EHhUpnZHX3xjuMEhn9FejcvX_wQ%3A1609872510608&ei=frT0X5DNJIjj_Ab_xqn4Aw&q=Clarion+c9cd+v6+650+set+language
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