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820-00609-A Apple iMac 27" 5K Retina

I have a corrupt BIOS that keeps looking for a paired fusion drive before booting. Stuck at Apple Logo. Can BIOS be repaired? Clean ME?

820-00609 EMC 3070
 

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imac18,1.BIN
8 MB · Views: 8

After uploading, two of five LEDs light up and the windmill turns on. What is wrong ? Please help.
 

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