Thanks for all your work on this project. I upgraded a sierra installation which worked fine and then I decided to upgrade my SSD to APFS. Everything coverted fine but when I ran the bootloader, it said "boot file not found". When I hit option on startup, I see the EFI volume and my USB drive but not the APFS drive. I do see the drive in disk utility and I installed High Sierra on another drive and can access my files on the APFS drive. I just cannot get the bootloader to find the "boot file". This is my info of the APFS drive with High Sierra installed but cannot boot into. This drive is the only drive with one partition when the bootloader runs. Thanks for your help.
Volume name : SSD
Volume type : APFS Volume
BSD device node : disk1s1
Mount point : /Volumes/SSD
File system : APFS
Connection : SATA
Device tree path : IODeviceTree:/PCI0@0/SATA@B/PRT0@0/PMP@0
Writable : Yes
Is case-sensitive : No
File system UUID : xxxxxxxxxxxxxxxxxxxxxx
Volume capacity : 524,902,957,056
Available space (Purgeable + Free) : 90,062,727,194
Purgeable space : 3,307,546
Free space : 90,059,419,648
Used space : 434,679,808,000
File count : 1,224,156
Owners enabled : Yes
Is encrypted : No
System Integrity Protection supported : Yes
Can be verified : Yes
Can be repaired : Yes
Bootable : Yes
Journaled : No
Disk number : 1
Partition number : 1
Media name :
Media type : Generic
Ejectable : No
Solid state : Yes
Parent disks : disk1