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Hi @NaomiLin ,
Some users are reporting a GRUB prompt while booting with the new image. In most cases, as long as the USB is correctly prepared, exiting the prompt or tinkering with the bios/UEFI boot settings usually fixes it. (Please do not attempt to modify BIOS settings if you are unfamiliar with it. You can cause harm to your device).
If all tries fail, please use the older image - https://static.redhat.com/downloads/training-certification/rhrexboot-2020-08.iso
The devs are working on a newer image, which should solve these issues. without the need to modify bios settings.
I already passing EX180 Kubernetes Exam with old Exam Boot Image it working perfectly fine but connectivity is quite lag so you need to really prepare yourself because browser mouse keyboaard will be lagging please prepare and be fast exam didn't super ultimate hard like that but it comprehensive every chapter.