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Help to resolve ERROR 12 with my iMac 27’’ Mid 2011 with Akitio T...

Help to resolve ERROR 12 with my iMac 27’’ Mid 2011 with Akitio Thunderbolt 2 and eGPU RX560  


New Member
Joined: 7 months ago
Posts: 3
Jan 4, 2019 1:48 pm  
Good afternoon,
I am Luigi from Italy. I need your help to be able to correct configure and use a new bought eGPU for my old iMac. Now I am describing my configuration:
  • iMac 27’’ Mid 2011
  • 20 Gb RAM (8+8+4)
  • AMD Radeon HD 6770M 512 Mb
  • Akitio Thunderbolt 2 enclosure with MSI AMD Radeon RX560 4Gb
  • SSD 250 Gb (It replaced the old HD)
It is all ok in MacOS High Sierra 10.13.6 thanks to PurgeWrangle script. The serious problem is, instead, with Windows 10. After several attempts, I managed to install Windows 10 (Spring Update) to my unsupported iMac, after BootCamp Assistant Modification, following this guide ( ). The system worked fine except eGPU, that was detected and (apparently) correctly configured, except for the famous ERROR 12… I have tried all methods in forum (from EFIboot, to Large Memory USB hack, to DSDT ovveride), but no one resolves the error 12… I am waiting for you kind response, thanks in advance.
This topic was modified 6 months ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts