On other disk I have 10.13.6 and after safari and security update I get black screen so I used my Mojave efi to boot but I lost H264 support and hardware encoding if someone wants to knowView attachment 381299View attachment 381300
ComboUpdate installer shows this:
"macOS 10.14.3 Update can't be installed on this disk. This volume does not meet the requirements for this update."
Regular installer seems fine and is allowing install.
SSD Drive is APFS and 10.14.2 installed with 155GB free.