First off a HUGE thank you goes out to Jay for putting this amazing guide together! Without the guide I'd be lost for sure.
I too am having the same issue not being able to get into Imessage. A little background, I installed mavericks 10.9 onto its own HDD on my Asus G74SX laptop using clover as my boot program. I had initially encountered the activation error. I ended up generating a new UUID and new SN and MLB/ROM.
I was excited to finally get the contact apple with the customer code. The code being the same every boot. So I called apple, spent almost 1.5 hours with them and they remoted into my laptop(barely bad connection where Im at)
They of course couldn't find the SN in their system I told them I bought it from a coworker and am new to the mac world. They said thats odd, checked a backup system, etc and then off we went. The tech called his next up and learned it was a registration lockout he never heard of before and then he said it was unlocked and he verified the serial number was correct and tried again after a reboot. Rebooted and got the same ole contact customer code.
Not sure where to go from here. I got transferred to the senior advisor, he tried to remote in but due to my connection the remote service locked up right after my skype call got disconnected.
Im frustrated but know if theres a solution someone will come up with an idea. If anyone skilled wants me too provided them my config or what ever logs let me know and I'll PM them.
It seems by first look uneducated that some how apples servers arent liking our hackintosh's and maybe its utilizing something else?
Thanks,
Pat