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help upgrading from sierra to high sierra

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Im really struggling to upgrade my machine - I can instigate installing high sierra from sierra but on the first restart prior to installing I get infinite loop after clover and apple screen. I think this is graphics related from what Ive read. Problem is,  cant load Nvidia updated drivers till im actually booting from High Sierra. 

Ive lost a lot of days with this and I'm prepared to pay for support from someone who really understands Hackintosh. 


My set up is GAX79-UP4 with i7- 3930 6 core processor. My Graphics card is  Nvidia Quadro k1200. I have tried with an old Geforce 9500GT too.  same story. Be grateful for some help.....

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I am also facing the same problem. I installed Sierra from Niresh bootable image which worked pretty fine. Now downloaded Sierra High in Apple store it is in App format now, but unable to upgrade it. Why can't I do this? What tweaks needs to be done to get this working? 


Please assist.

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