USB created with dd wont boot

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I downloaded the newest RHEL 8 ISO (9 GB) and created a bootable USB with "dd" command in CentOS 7.9. But it wont boot at system startup. I tried it with 2 different USBs but to no avail.
2ndly I tried the Rufus software on windows which also said that there is some kind of "Lock" on the ISO image from the its creaters so it (Rufus) also used the "dd" option to create the USB and the result is the same that it wont boot to start the installation process.

What can I do to resolve this issue.

Taimur

TF

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