Okidoki.
No promises that this will definitely work, but it won't hurt.
Download Line 6 Updater.
Download Firmware v2.80.
Plug in to your computer and switch on your Helix.
Open Line 6 Updater in offline mode.
Find your device, and do a manual install of the v2.80 firmware you downloaded.
When done, close Line 6 updater,, unplug the Helix and do a factory reset of the Helix.
Plug the Helix in to the computer.
Open HX Edit. Follow every instruction to the letter and be patient. I expect there to be an error message along the way. Don't panic. Keep following the onscreen instructions.
Assuming it updates successfully, do another factory reset and install a backup of your presets.