During the process of replacing the image, the machine got stuck and kept displaying "Stop". This state has been there for a week. During this period, I tried to click on Force Stop, and the result was "Detaching the boot volume."
But I am a free user subscriber, so I cannot initiate a work order. I asked the pre-sales consultant, and he told me that I need to go to the ORACLE forum to open a post to seek help.