Late 2013 15" 2.3GHz i7 - EFI Issue

Rendering Error in layout Widget/Social: Call to a member function exists() on null. Please enable debug mode for more information.
1 year 1 month ago #11371 by Sportsman04
Hello, I am new to this site and wanted to thank folks for any help they can provide. I have a Late 2013 15" 2.3GHz i7 - model A1398 with EMC 2745. I tried to change the serial number of the device by pulling down a read from the EFI, modifying the serial number and reprogramming. Now when I try to turn on the mac all I get is slow fan spin and never anything else. No screen, no startup tone, no keyboard backlight, etc...

I have tried to re-program the EFI with the unchanged .bin but get the same results. I have read a lot about the region and things that could have changed. Any help with this would be greatly appreciated. If needed I can send folks my initial read from the chip.

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