Install from HardDisk - Fedora 32 - Boot Live ISO from HDD using Grub

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well, no reply so far but I have fixed this be below code

 menuentry "Fedora 32" --class fedora --class gnu-linux --class gnu --class os {
        set iso_path="boot/images/Fedora-KDE-Live-x86_64-32-1.6.iso"
        export iso_path
        search --set=root --file $iso_path
        loopback loop (hd0,2)/$iso_path
        probe --set isolabel --label (loop)
        linux (loop)/isolinux/vmlinuz root=live:CDLABEL=${isolabel} rd.live.image verbose iso-scan/filename=${iso_path}
        initrd (loop)/isolinux/initrd.img
}

its in /etc/grub.d/40_custom

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