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Asus Z97-A Thunderbolt Big Sur

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Nov 15, 2010
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Motherboard
AsRock Z370M ITX/ac
CPU
i7-8700K
Graphics
AMD 5700XT
Mac
  1. iMac
  2. MacBook Pro
  3. Mac mini
Mobile Phone
  1. iOS
Hi All,

I upgraded my Z97-A with my Thunderbolt EXII from 10.11 to Big Sur and changed the boot loader over to OpenCore 0.7.3 in the process.

However, my Thunderbolt 2 stopped working. It was working under 10.11 but on a cold boot only with no hot swapping. Now, if the device is connected at boot, it is recognized (see attached pics), but does not work (used Apple TB to Gigabit Ethernet Adapter for testing).

I know this was a Mobo/combo that TonyMac had directly at one point.

Any tips/configs to share?

I changed the BIOS settings to "No Security" and set my cache size to 128 (default 32), but no difference.
 

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