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Same here. I had the same problem with my 7700K. It's a hard block, unfortunately—that generation just missed the cutoff.

Yeah, You could also try clearing the CMOS by removing the motherboard battery for a minute, as a corrupted BIOS setting can cause this.

This. You could also try using a third-party tool like Rufus to create a Windows 11 installer that bypasses the TPM and Secure Boot checks.