stands for Desktop Management Interface . In modern systems, this is often referred to as SMBIOS (System Management BIOS). The DMI tool is a proprietary command-line utility (usually named DMITool.exe or AcerDMI.exe ) that writes specific system information directly into the motherboard’s firmware (BIOS/UEFI) NVRAM.
Because these are proprietary service tools, they are not typically hosted on official Acer consumer support pages. They are primarily found on enthusiast and technician forums: acer dmi tool link