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now mac have a serial but different from my mac, i need change or can use this?

Need buy 70$ tool to write sn?

ok, now mac boot on ok and i intalled big sur. After install big sur need write sn? thanks

Clear me first?

So i need write bin file attached in link post first? This is my first time with mac tool

I need write my mac serial number before write bin file?

Hi everyone, i have macbook air 2017 13" 1.8ghz A1466 820-00165-A with bad backup efi chip file. Anyone can help me to revive my mac? i use ds809s tool to write file but now only start fan for bit seconds when press power button and after a seconds shut down withouth show anyting to display...