memtest86+

I missed that moment when Memtest86+ disappears from boot menu. Instead of blue color GRUB menu I see only black menu with few different Kernel options. How can I get Memtest back?

Setup: Hardware: Motherboard: MSI B350M Gaming Pro (MS-7A39) CPU: AMD Ryzen7 1700 8 core GPU: AMD Radeon RX 470 RAM: 16GB DDR4 @ 1300MHz Storage: 2 2TB WD HDD, 1 1TB WD SSD. Both SATA Network: ASM1182e 2-Port PCIe x1 Gen2 Packet Switch; static IP Boot drive: Crucial BX500 240GB 3D NAND SATA...