You will want to follow the instructions for creating a custom .iso https://access.redhat.com/solutions/60959 ^^^ Requires a Red Hat account, or Red Hat Developer Account. The keys are to modify both: - /isolinux/isolinux.cfg - for legacy BIOS boot - /EFI/BOOT/grub.cfg - for UEFI boot Make sure not to change the Volume Label, as this can mess up the UEFI boot Then generate the .iso: # cd /tmp/rhel7/ # mkisofs -o /tmp/rhel7test.iso -b isolinux/isolinux.bin -J -R -l -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e images/efiboot.img -no-emul-boot -graft-points -V "RHEL-7.7 Server.x86_64" . ^^^ Change the "-V" label accordingly for CentOS 8 to match the CentOS 8 disk label. And the critical command for USB drive booting: # isohybrid --uefi /tmp/rhel7test.iso Gregory Young -----Original Message----- From: CentOS <centos-bounces at centos.org> On Behalf Of Jerry Geis Sent: October 4, 2019 11:30 AM To: CentOS mailing list <centos at centos.org> Subject: [CentOS] USB ISO for CentOS 8 I did the dd of the ISO to a 16G USB device. the second partition is FAT so I can edit it - I want to make a custom menu entry. I edited the grub.cfg - but that did not work - my menu option does not show. Then I think I need to change BOOT.cfg and generate the grub.cfg - but I dont know in this case how to generate for the USB device. What command do I use for that ? Thanks, Jerry _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos