I get stuck at the +++++++++++++++++++ signs during Installer boot, no matter which USB port I use. I have tried changing the boot flags by adding PCIRootUID=0 and USBBusFix=Yes, in case it would help, to no avail.
I have previously installed successfully Yosemite and SierraAMD v2 (Shane's installer) and they work fine (after some juggling). But, High SierraAMD seems to elude me.
mobo: GA 990XA-UD3
CPU: FX 6300
Graphics: AMD Radeon HD 6770
cpu: AMD FX 6300
Graphics card: AMD HD 6770 1GB
USB 3.0 built-in controller ETRON EJ168 (not functional)
USB 3.0 discrete PCIe controller
OS's: macOS 10.12.6 SierraAMD (256GB SSD), macOS 10.12.6 SierraAMD clone (256GB partition HDD), OS X 10.10.x Yosemite (external bootable USB 3.0 HDD), Win 10 64bit (256GB SSD), Win 7 64bit (500GB partition HDD).