I tried installing 10.14.4 on my flashed 4,1 last week and had problems. If this has been already covered somewhere, please forgive me and let me know where to go or what to search on.
4,1 flashed to 5,1, hex core 3.46, 32GB RAM
AMD Radeon HD 7950 3072 MB (NOT a Mac edition)
System Info shows: Supported, feature set macOS GPUFamily1 v3
Running 10.13.6 on a SSD located on a OWC Excelsior S card, formatted for APFS
Boot ROM 141.0.0.0
I downloaded the Mojave installer
Ran it to update firmware, rebooted
Installation continued, prompted for reboot.
On reboot I had black output on both screens. I waited like 45 minutes and power cycled the machine, back to black screens. I was able to boot into Safe Mode at which point my machine took me though setup as though I did a fresh installation. I was hoping to upgrade, not perform fresh install.
After going through steps to setup a new account, I went to reboot in normal mode, black screens again.
1) Was I too impatient during that black screen portion of installation?
2) I saw in a different thread about during the Mojave Betas that people were able to install using the command line:
sudo /Applications/Install\ macOS\ Mojave\ Beta.app/Contents/Resources/startosinstall --volume /Volumes/Mojave
Do I need to do something like this for the release version?
3) Is my video card just not supported?
Thank you for any assistance.