Guest DeppJones Posted November 18, 2021 Posted November 18, 2021 I recently had to change the back plate of my cMP 4,1 flashed to 5,1. Since I previously used x5680 CPUs and a PCIe drive I have to flash the back plate to 5,1. Here is where the problems start… Every time I try to boot from a USB stick to install Mojave, the system stuck at: AppleHDAEngineInput::performFormatChange (<ptr>, <ptr>, 0) IOConsoleUsers: gIOScreenLockState 3, hs 0, bs 0, now 0, sm 0x0 What‘s the problem? I have already removed all drives except the one for the Mojave installation. Source: MacRumors
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