After Install FreeBSD 10.1 from a EFI memstick, my pc boot was messed up. It only boots from PXE and cd or hard disk and I can't enter to BIOS setup, even after clearing CMOS moreover, motherboard's recovery mode failed too. I managed to install fedora 21, but i can't touch EFI variables from here (it boots in normal bios mode).
I booted from a windows recovery disc, and checked efi partition and nvram as many sites state. I have checked firmware entries and I realize that NVRAM has at least 10 entries(samsung notebooks failed in this way too). I suspect that this is making firmware behaves this way. Please, I need help. I need to clear EFI nvram without booting in uefi mode, from some OS. I really don't know how to make this.
My motherboard is Intel DX79TO.
Summary:
I can't enter to bios setup
I can't enter recovery or service mode
I can't boot in UEFI mode, then I can't use "efibootmgr" from OS'es like Linux
Windows rescue disc boots in bios mode, and it can't clear NVRAM in the usual way (https://technet.microsoft.com/es-es/library/cc749510(v=ws.10).aspx)
Please, I need help desperately