Use a test installation of 11.2.3 or make sure to have a back up before proceeding.
I'm running OC 0.6.8 with the Plistlib Generator
setup.py example configuration (see
#348 for my config.plist).
From 11.2.3, I updated to 11.3 with Software Update. It got stuck once at the progress bar (see below why) forcing me to manually shutdown from the power button. After power-up, it went through installation process rebooting twice and I was presented with the 11.3 setup screen.
After installation, I determined the following pattern for my machine: If there are no computer problems previously detected, the reboot will get stuck at Progress Bar, no matter what. (that explains why upon initial upgrade, Progress Bar got stuck). In other words, everything works if I'm welcomed by the "
you shut down your computer because of a problem." error. Once I'm logged in 11.3 and I try to shutdown the Mac (which in 11.2.3 would fix this error message), I'm stuck at Progress Bar boot screen. As long as I don't shutdown, which will reset the shut down error, I can reboot fine many times (I tested the reboot 10 times). I also have a BootROM reconstructed by
@tsialex, which I refreshed one month ago.
I'm able to constantly repeat this exact pattern every time. Anything else is functional in 11.3, I'm able to login with my Apple Watch, perform AirDrop, Wifi, Bluetooth, etc. See my signature for all hardware upgrades.
In my case, I might have better success than others because the chip used into Syba SI-PEX40129 (see
#341 for chip details),
which is the same as HighPoint 7101A and reported to have proper NVMe functionality with Big Sur 11.3. See also
#337 for Sonnet Allegro USB3C-2PM-E PCIe card test.
Posting now from 11.3, these screenshots: