I have a laptop (pre-installed Win8) that has been through numerous dual-boot configurations. At one point, I had removed everything and ran Linux Mint as the only OS. Eventually, I decided to remove that and reinstall Windows 8.
Upon doing so, I had a number of drivers to install/update in order to restore some basic functionality (USB ports, HDMI, FN keys, etc.). This was relatively easy to fix as all the drivers I needed were online. The problem I'm left with though, that I haven't found anything which pertains to my specific situation, is that I can no longer boot into UEFI mode.
When I was running Linux Mint as my sole OS, I left UEFI boot mode enabled with Secure and Fast boot both off. In order to reinstall Windows 8, I burned the ISO to a USB and the ONLY way it would work is if I turned UEFI mode off, and used CSM Mode.
Since reinstalling Win8, I cannot boot into UEFI mode. Which is ultimately, I think, affecting my wishes to dual-boot Ubuntu alongside Windows again.
Any ideas as to how to fix this?
@Lưu Vĩnh Phúc , does this help?