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<< Solved >> Mojave installer circle with slash

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argh... i used one of those usb extensions that come with wireless mice for the dongle. that seems to have gotten me past this error. I assumed this would make it appear as usb 2.
thanks
For the benefit of everyone reading your [SOLVED] Post, please add what was the Make and Model of your macOSMojaveUSB Installer Flash disk to your message.
 
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I had same problem. Putting my USB installation stick to USB 2.0 port solved the problem. I guess you can also mount EFI from USB installation stick with Clover Configurator then edit config.plist with Clover Configurator in order to apply USB patch. You can find a lot of guides in this forum how to apply such fix (set proper KextsToPatch and put required Kext).

Of course all depends on the error message you get when you run installation with -v within boot arguments. In my case I've got something which was resembling the issue with USB port.
 
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my flash drive was a pny 16gb usb 3 turbo attache 4
p-fd16gtbat4-ge
 
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