FabianDeAsis

Well, thank you all very much for your great help, I solved it. Have a nice day.

In "Things I tried" I mention that I have disabled and enabled UEFI mode (I did it a lot of times), so the BIOS of that motherboard does have that option. Enabled or disabled, I can't boot the flash drive.

Hello everyone! I am having (since yesterday) a problem installing Mojave. In fact, it doesn't even boot the USB drive. I watched a few tutorials on YouTube, followed the guides here, copied the EFI folder for my motherboard (I have a DH67CL), used other flash drives, disabled and enabled UEFI booting, disabled Virtualization, and nothing. The error in question says "Reboot and Select proper Boot device or insert boot media in selected boot device and press a key". I know that means that the boot usb drive has not been recognized, or at least the RAW image I downloaded to install Mojave. So, I downloaded High Sierra and did exactly the same thing again. I flashed the image with Balena Etcher (without any errors), rebooted and selected the bootable USB drive and.... Nothing. But this time, I get an infinite loop of the following image: Things I tried: - Format USB drives with MiniTool Partition Wizard (because creating the bootable drive creates partitions with formats that Windows does not read, so I return the flash drive to its original state every time my attempts fail). - Using three flash drives (8gb, 16gb and 64gb respectively) including an external and an internal hard drive. - Toggle between GPT and MBR partitions with each attempt. - Download the same Mojave and High Sierra Olarila Image's at least 3 times each (only just in case...) - Install with Rufus (yes, it is possible, and it has worked for me before). Same result as with Balena Etcher - Disconnect each drive until only the usb drive is left. - Enable and Disable UEFI Boot, disable integrated IGP, boot without GPU (using the integrated graphics). - Connect each flash drive to each USB port on the motherboard (including a couple of USB 3.0 ports). - Connect all the pendrives in two other PC's and a laptop (and follow exactly all the above mentioned, to rule out any probability). I should mention that a year ago I installed High Sierra on this same computer without any problem, and the only thing I didn't try to do was to download the version I used then because it is removed from the site and I can't get it anywhere else. Ofc, currently, I just want to install Mojave. My Specs: - Mother Intel DH67CL - i5 3570 - 8Gb (2x4Gb) DDR3 1600 - Radeon R7 250 2Gb GDDR3 - Corsair CX450 - An SSD for primary OS and a lot of HDD's I appreciate in advance any help u can offer me, I'm already desperate hahaha. Regards!