Thanks for searching out the info for me. All these are super new to me, will study more and do more test.
I have a new 2TB SSHD laying around. So, I can delicate it for Cover test only. At this moment. I format the SSD into a single 2TB HFS+ partition (again, not counting the EFI partition). Clean installed 10.12.4 onto it (with recovery partition automatically created during the installation process). Will try to install Cover (Legacy mode) onto it.
[doublepost=1492617888][/doublepost]Just tried this setting, doesn't work as well. Exactly the same as before. Can boot to cover, but the screen only display when boot from Mac EFI ROM.
I have a new 2TB SSHD laying around. So, I can delicate it for Cover test only. At this moment. I format the SSD into a single 2TB HFS+ partition (again, not counting the EFI partition). Clean installed 10.12.4 onto it (with recovery partition automatically created during the installation process). Will try to install Cover (Legacy mode) onto it.
[doublepost=1492617888][/doublepost]Just tried this setting, doesn't work as well. Exactly the same as before. Can boot to cover, but the screen only display when boot from Mac EFI ROM.