: Some drivers or firmware-level protections silently ignore or reject any MAC address that does not follow this specific "local" format.
Modern Windows and macOS drivers are increasingly restrictive. Even if you use third-party software, the WiFi card firmware might override your request. On Windows: : Some drivers or firmware-level protections silently ignore
02:11:22:33:44:55 First octet: 02 (binary 00000010 ) → Bit 2 = 1 → Locally administered → Success : Some drivers or firmware-level protections silently ignore
When you see "Set the first octet work" , the software is telling you: Choose a first octet that has bit 2 = 1. : Some drivers or firmware-level protections silently ignore
Linux (most distributions)
that trigger the error: