You can quickly verify if your system uses version 2.6 or later using the following commands: System Management BIOS Reference Specification - DMTF
SMBIOS version 2.6 is widely supported by modern computer systems and is used by a variety of software and hardware components to manage and monitor system configuration. Some examples of how SMBIOS version 2.6 is used include: smbios version 26
No standard is perfect, and SMBIOS 2.6 has well-known limitations that forced the industry to move forward: You can quickly verify if your system uses version 2