I can't seem to locate a copy of MMTool 4.50.0.23 (required since this Shuttle is an Aptio 4). But I was able to use the UEFITool to open the original UEFI. I exported the microcode module body (17088572-377F-44EF-8F4E-B09FFF46A070.RAW) and manually patched the microcodes and updated the offsets (0x800 boundaries) and adjusted to original file size (124,928 bytes). Now it's time to test! Fingers crossed!
README for BIOS mods Code: SH67H000.206 = Shuttle SH67H3/SH67H7 BIOS v2.06 [STOCK BIOS] o Intel Microcode (SandyBridge 0x29/IvyBridge 0x12) o Intel RAID OROM 11.0.0.1339 o Intel UEFI VBIOS SandyBridge/IvyBridge 2137 o Intel UEFI GopDriver SandyBridge 2.0.1020/IvyBridge 3.0.1018 -- SH67_TR1.ROM = SH67H000.206 + Intel Microcode 20190514 (SandyBridge 0x2F/IvyBridge 0x21) + Intel RAID OROM 13.5.0.2164_TRIM + Intel UEFI VBIOS SandyBridge/IvyBridge 2171 + Intel UEFI GopDriver SandyBridge 2.0.1024/IvyBridge 3.0.1030 + Intel UEFI RaidDriver/SataDriver 13.5.0.2164_TRIM (GUID-90C8D394) SH67_TR2.ROM = SH67H000.206 + Intel Microcode 20190514 (SandyBridge 0x2F/IvyBridge 0x21) + Intel RAID OROM 13.5.0.2164_TRIM + Intel UEFI VBIOS SandyBridge/IvyBridge 2171 + Intel UEFI GopDriver SandyBridge 2.0.1024/IvyBridge 3.0.1030 + Intel UEFI RaidDriver/SataDriver 13.5.0.2164_TRIM (GUID-91B4D9C1) -- SH67_TNV.ROM = SH67H000.206 + Intel Microcode 20190514 (SandyBridge 0x2F/IvyBridge 0x21) + Intel RAID OROM 13.5.0.2164_TRIM + Intel UEFI VBIOS SandyBridge/IvyBridge 2171 + Intel UEFI GopDriver SandyBridge 2.0.1024/IvyBridge 3.0.1030 + M.2 NVMe UEFI (NvmExpressDxe_4) -- SH67_TNA.ROM = SH67H000.206 + Intel Microcode 20190514 (SandyBridge 0x2F/IvyBridge 0x21) + Intel RAID OROM 13.5.0.2164_TRIM + Intel UEFI VBIOS SandyBridge/IvyBridge 2171 + Intel UEFI GopDriver SandyBridge 2.0.1024/IvyBridge 3.0.1030 + M.2 NVMe UEFI (NvmExpressDxe_4) + M.2 AHCI UEFI (SAMSUNG_M2_DXE)