To provide SMBIOS support for version 2.6 (specification 2.6, released in 2008), you would typically implement features such as new structure types, extended field lengths, and better 64-bit system support.
: Introduced the "Built-in Pointing Device" and "Portable Battery" structures to better support mobile and specialized hardware reporting. String Limitations smbios version 26
Further Reading
…and saw “26” — that’s not SMBIOS spec version but a vendor string.
To check real SMBIOS version: To provide SMBIOS support for version 2
"SMBIOS Version 2.6" (often displayed as SMBIOS Version 26 in some diagnostic tools) refers to a specific iteration of the System Management BIOS What is SMBIOS? SMBIOS is a standard developed by the DMTF (Distributed Management Task Force) released in 2008)