Fixed, see my response below.
I had 3.6 installed, ran the update to 3.7 from HX Edit. If failed and said it had to reboot. When it rebooted it gave the "Boot Failure. Entered update mode" message but HX Edit could not see it. Googled and found this post. Per instructions I downloaded Line6 Updater 1.28, installed and followed the steps by Datacommando above, line6 updater saw the helix and installed 3.7 (edit: I used the online option, don't do that) and said it was successful and would reboot. It booted showing 3.7 on the initial splash screen then goes right back into boot failure. Also there is a red 0 in the upper left corner of the screen. I tried the factory reset by holding SW9&10 and it said it was resetting all presets, IRs, etc but went right back to boot failure. Trying a few more things but posting now with finger's crossed. My Helix is under warranty.