When I was trying to reinstall windows by using a bootable flash drive which uses MBR partition, it just doesnt appear in the boot selection menu.I have tried GPT also but the problem is that GPT appears and the setup starts but my drive is MBR so it doesn't install , and I don't want to format my drive.So I thought I will back up the data but after closing the setup windows has created a bootloop and is not starting.So is there any way to boot into an MBR flash drive.