1. Download the blank Board Serializer compression package in the attachment and unzip it to get blank Board serializer.dmg
2. Burn the blank Board serializer.dmg into a USB flash drive or DVD. (Too troublesome or will not burn the classmate can directly decompression blank Board SERIALIZER.DMG, unzip all the files dragged to an empty U disk on the line)
3. Then use a burned USB flash drive or DVD to boot (press and hold option on the boot to select)
4. write the serial number of your previous motherboard , and never make a mistake .
5. Boot look system, your serial number is back, you can use imessage and other software!
Enjoy it!
Update: Add Baidu Cloud Address Link: Http://pan.baidu.com/s/1sjFImRz Extract code: 5R2G
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Troubleshooting system serial# writing serial number to Mac motherboard tutorial