There is no factory reset in GRUB in 8.4. Is there any way to perform factory reset without downloading the image file? If no, can I make a bootable USB or I have to burn the image to DVD?
You need to burn the rsa-am-hardware-appliance-126.96.36.199.0.iso to DVD, and boot system with it.
Thank you for your response. I have downloaded the image file, but when I tried to make a bootable USB, it fails and said 'could not open image'. Is it a must to burn iso to DVD?
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