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Mobo doesn't recognise Clover UEFI (High Sierra)

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Aug 22, 2011
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Motherboard
Intel DQ77MK
CPU
i7-3770
Graphics
HD4000
Mac
  1. iMac
  2. MacBook
  3. MacBook Pro
  4. Mac mini
  5. Mac Pro
Classic Mac
  1. Power Mac
  2. PowerBook
Mobile Phone
  1. Android
Hi, I have an Intel DQ77MK Mobo which is working well with OSX 10.8.5 (for legacy apps), OSX10.10 Yosemite and a slightly buggy OSX10.12 Sierra.

Now I've just built a couple of High Sierra Installs - one on an SSD in HFS+ format, and a 2nd SSD in APFS format.
These SSDs were blessed using Multibeast.
They both run, but ONLY if I boot via Clover on the USB stick that I made with Unibeast.
Using gpt, I can see the EFI partition is on the SDD with the correct name, size and UUID.
I can mount it and see the folders, which look correct.
But the mobo just says 'insert boot media' for the HS disks (the older OS disks boot fine)
I'm guessing its something wrong with the partition ?
Can anyone help me ?
Many thanks
 
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