Hi. Is it possible to go further or should I give up?
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Hi michalzienia - and welcome to the forum! 
Can (are you willing?) to share a bit about your situation?
From the image alone, I’m tempted to reply “probably” to the question … 
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Never mind. I know what’s going on now. I thought I had read the installation guide carefully, but somehow I missed the part that after making usb with Rufus, the verification would not work.
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Before flash (dd) this media you check hashes and signature?
After flash (dd) you double check hashes?
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I recorded it again, this time via dd, and it’s fine.
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Hi michalzienia
Great!!
Could you mark the message about writing with dd as the solution? – just to help the next one landing on this topic …
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Should I worry about this Firmware Bug APIC ID mismatch?
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No.
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