The error "Failed to change MAC address... set the first octet" is simply the driver telling you that you are trying to use an address format that isn't allowed for manual assignment.
Disable and re-enable your Wi-Fi card if the network fails to pull a new local IP address immediately. The error "Failed to change MAC address
✅ 02:11:22:33:44:55 (Will succeed because the second digit is 2 ) ✅ 02:11:22:33:44:55 (Will succeed because the second digit
If your desired MAC address is being rejected, change the of your first octet to one of these specific hexadecimal values: x2 (e.g., 02 , 12 , A2 ) x6 (e.g., 06 , D6 , 26 ) xA (e.g., 0A , DA , EA ) xE (e.g., 0E , DE , 2E ) How to Fix It Find your wireless adapter (e
By setting the first octet to end in (e.g., x2-XX-XX... ), you are signaling to the system that this is a Locally Administered Address (LAA) . Modern wireless drivers, especially on Windows 10 and 11, strictly enforce this to prevent network instability. How to Fix It
Find your wireless adapter (e.g., Wi-Fi) and note the . Observe its first octet. It will likely be something like 2C , 74 , A4 (even and with bit 2 = 0 – globally unique). You cannot reuse this exact format for spoofing.
