Secure Boot not available on B250 PC Mate after enabling custom Secure Boot Mode, enrolling new keys, changing RAM and then resetting BIOS and keys. See comment : r/MSI_Gaming
MSI B250 PC MATE LGA1151 Intel ATX DDR4 Motherboard
MSI B250 PC MATE LGA 1151 Intel B250 DDR4 USB 3.1 ATX Motherboard | 911-7A72-014 Buy, Best Price in Russia, Moscow, Saint Petersburg