: After clicking "Change Now," the tool might say it failed even if it worked. Manually disable and re-enable your adapter to force the update: Open Device Manager . Right-click your Wi-Fi adapter and select Disable device .
A second constraint involves the unicast/multicast bit (bit 0). The first octet’s least significant bit must be 0 for a unicast address (which a network card requires). Setting the first octet to an odd number (e.g., 01 , 03 , 05 ) would make the address multicast, causing the card to ignore unicast traffic. Thus, the driver actively prevents such changes. Consequently, many users trying to set a custom address like 00:11:22:33:44:55 (first octet 00 – even, but with locally administered bit = 0) or 01:02:03:04:05:06 (first octet 01 – multicast) will see a "failed to change" error. : After clicking "Change Now," the tool might
If the software previously crashed while changing the address, the registry value might be stuck. A second constraint involves the unicast/multicast bit (bit
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