crwdns2934241:0crwdne2934241:0 Saeed Akbaripoor

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Can't find the brightness changer mode

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I have Casio 991-MS calculator and have an issue to change my display brightness,when I switching with Mode key,I can't find Cont mode,while in another same calculator there is , anybody can help me with that quickly?

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Casio FX-991ES Plus

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open