In bios boot option. USB boot option is not available

To enable USB boot on your Dell OptiPlex 7090:

1. Restart your computer and press F2 repeatedly to enter BIOS.
2. Ensure UEFI Boot Mode is enabled under Boot Sequence settings.
3. Enable "USB Boot Support" in the USB Configuration section.
4. Disable Secure Boot if necessary under Security or Boot settings.
5. Save changes and restart with the USB drive plugged in.

This should allow your system to recognize and boot from the USB drive.