Boot from USB drive to load RHEL on a SSD

I'm strugling to boot RHEL on a SSD with my HPE MicroServer Gen8.

Here is some related information.:

 Installed RHEL8.1 on a 128GB SSD(SATA5 /dev/sdd), a 4GB USB drive on USB port(/dev/sdb), and 2x5TB HDD (SATA 1&2, /dev/sda /dev/sdc)

I set bios to boot USB drive first, Mobdro so it can Kodi chainload bluehost bluehost to boot SSD (RHEL 8.1). I've tried this method

But the file system seems different, also grub2 commands are not fitting the current RHEL 8.1.

Would somebody help me on this?

Thanks and have a good day.

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