macOS Big Sur installation steps :
Reminder post
#1 & post
#2
1.1 / If you have a previous public beta installed launch directly install macOS Big Sur - Open Core 0.6.3 is required
1.2 / if you have not Big Sur installed, Boot the USB stick with install macOS Big Sur Open Core 0.6.3 is required, after you reach the installer , format your disk as "Big Sur"
2/ Select the disk "Big Sur"
3.1 / Wait during the installation process until your computer restart
3.2 / First reboot :
IMPORTANT : at gui boot screen select
Macintosh HD (
not Big Sur) : the installation process will continue in verbose mode mode during about 4 or 5 minutes (lots of verbose pages ...)
3.3 / Second reboot : at gui boot screen select Big Sur : installation process will continue with Apple Logo about 2 or 3 minutes the progress bar will be short
3.4 / Third reboot : at gui boot screen select Big Sur : the installation first ends in verbose mode and after the log screen will appear: you are done
( Not tested on X299 build yet with USB installer only in my old H87 build but it must also work for our system)