Macbook EFI update problems

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Hi

Im having a problem trying to do the update and keep getting this error

"Your firmware can not be updated because the hard drive partition scheme may not be supported. You must be booted from a GUID partition or RAID scheme."

Now according to system utilities my hardrive is a

"Partition Map Scheme : GUID Partition Table"

I really dont want to format the drive for this update but is that my only option.

Any help welcome!
 
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