Don't worry it's matter of a couple of minute to install, reboot reset pram and reinstall a fresh copy of OS X and you are just like before messing things up
iCloud and iMessage Work as usual?
The serial number remain the same?
I've made the same mistake Tuesday........
I've ordered a Efi Chip from Macunlock.....
I'll receive it on Monday........
I hope to restore my MBP Retina......
Update 15/1/2018 18:20
Solved Everything is working now!
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