Yamaha CVP 205 Won't Power Up

(Bonny Island, Nigeria)

I need your support to fix the error on my CVP 205 Yamaha piano. The screen displays this unexpected error “hisysdwn. c/133/8C1BB524”, “hisysdwn, c/133/8C1A4C78’” each time I repeatedly put ON the piano. The piano does not boot rather displays these error with a message to turn OFF n turn ON again.

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