[Q] Change MAC address on Nexus 9 CM 12 topic

Hi
I've got one problem. I was trying to change my MAC address on Nexus 9 with CM 12. That operation was successful.
I changed it by commands

Code:

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su
ip link set wlan0 ADDRESS 00:00:00:00:00:00

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And I also tried app "MAC Spoofer" . Both successful. But after changing MAC address I can't connect to WiFi. There is a problem with authentication. So I was looking for a solution on XDA. I found it http://forum.xda-developers.com/show...&postcount=214 but I don't understand it. Could anyone tell me what should I do step by step?
Regards,
maciek1235