Un-supersu

I have malfunctioned my wechip box. Because tried to change superuser to supersu. Now it getting stuckt at h96 screen. Can I fix this without reinstall firmware . I can not find suitable firmware. I think it is a clon or fake wechip box. 2Gb 16 gb s912 model. One of firmware can be installed but wifi and bluetooth does not work and it frequently freezinng some fcs and working toooooo slow. Pls help

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