@timeflux: This is Rev.1 which was publically (correct?) available - 10.5.1 Rev.2 not and Rev.2 is signed as Leopard-AMD-EFI-10.5.1 because EFI+GUID is avaiable in Rev2 and this works (tested on my AMD Laptop) Hope too that 10.5.2 which is now officially available will be integrated as soon as zeph has time to!