I finally installed. I also had the "black screen". I think it was because I went into download mode from TWRP instead of using the native button method, but not sure. Using TWRP, everything seemed to work, but I got the black screen. When I manually forced reboot into Download mode using power+volume down+home, it prompted me to go into download mode with volume up or exit with volume down. When I ODIN'd the bootloader that way, it "took". Then I wiped and installed and everything was fine.
Thanks Civato! Greatly appreciated.
Thanks Civato! Greatly appreciated.