If you monitor has a option to downgrade to DP v1.1 or a DVI port, use it, if not, you will need another monitor. You can't update to 00, or newer firmwares, with a 4K/DP v1.2/1.4 screen connected to a GPU that has hardware support for DP v1.2/1.4 (read the note). For GPUs that support DP v1.2/1.4, disconnect any 4K or DP1.2 display. Please note that if your flashed GPU is not macOS installer compatible, like NVIDIA GPUs from Maxwell and Pascal generations, you need to install one that is. Any original Apple card from 2008 to 2012 (HD 2600XT, 8800GT, Quadro FX 5600, GT120, HD 4870/5770/5870) or 3rd party Mac EFI cards like Sapphire HD 7950 Mac Edition, eVGA GTX 680 Mac Edition, NVIDIA Quadro 4000/K5000 or self-flashed/MVC flashed cards. Apple OEM GPUs or Mac EFI flashed GPUs are a requirement for upgrading to 00. This part of the BootROM upgrade require a GPU with pre-boot configuration support. If you have an earlier than 00 BootROM version, these are the steps to upgrade your BootROM to have Mojave support: PCIe drives are bootable, exactly as the internal ones.
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