According to page 2-13 of your motherboard manual, the CSM and Secureboot options are visible if you scroll down in the "Boot" menu.
"Advanced Mode" -> "Boot", scroll down https://dlcdnets.asus.com/pub/ASUS/mb/LGA1150/H81M-K/E8601_H81M-K.pdf?model=H81M-K On Thu, Jan 25, 2024 at 4:02 PM Markbiophysicist <markbiophysic...@gmail.com> wrote: > > I am sorry. I am from Spain and I don't know how to speak English very well. Thank you very much for your advice but I cannot do it, because my BIOS doesn't have these options. Neither Secure Boot or CSM. > > Is possible to install the multiboot in this computer. I know it because I have already had this done, but, at that moment, I had installed one disk alone. Now, I have two disks and multiple partitions and it's not working.
