
Anyway, I've just tested the ESP8266 1.50 and the mac changes without problem, the command
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OPTION.MAC "00:00:00:01:00:27"
I can see that my router gives automatically another IP address when changing the MAC
The probable solution is :
In your program, you must first change the mac address and then use the command WIFI.CONNECT
Something like :
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OPTION.MAC "00:00:00:01:00:27"
WIFI.CONNECT .......