I have XPS 8930 desktop which showed boot failure after soft ware update. I tried change boot order, legacy or UEFI etc but nothing seems to change the message of boot failure. Even call Dell support and referred me to software department and they couldn't resolve the issue and refund the money I paid to me. Refer me hard ware department to change the DVD Drive which I replaced it myself and still not solve the issue. Now I was referred to hardware department for another service and awaiting for it. Meanwhile, any one has similar experience and can share how they fix it please. I cannot go to recovery window and I don't think I backed up my PC to USB image or CD/DVD because these are usually useless from my experience.