(SOLVED) Switching existing 10.9 setup from Chameleon to Clover UEFI

[bdv]

Hi.
 
I am trying to switch my running rig from chameleon to uefi clover.
I ran into a problem: clover does not seem to "see" my drive as uefi OS to boot it.
I successfully install legacy clover, but could not boot this rig using uefi clover (same dsdt, settings etc that worked with legacy clover).
 
The rig:
 
Asus P9X79-WS, Xeon E5-1650, 16 GB ECC ram, Asus GTX650 1024 MB with GOP VBios, Crucial MX500 SSD 250GB.
OSX 10.9.5
 
This rig worked fine under 10.9.4 + chameleon, 10.9.5 + chameleon and works fine with 10.9.5 and legacy clover.
 
Asus bios does not identify the SSD as UEFI drive, only legacy (I think that this is the real problem).
SSD was partitioned under osx as GPT, it has EFI and Recovery HD partitions.
 

EDIT: Solved.
I made a backup of the disk and make a clean GPT partition with disk Utility.
Restore backup, reinstall UEFI Clover on EFI partition and it boots in UEFI mode, disk is seen as UEFI in Asus "bios".
I do not know what was wrong with the original GPT partition, anyway, it is fixed.