Just had the exact same thing happen on my Helix LT.
I upgraded firmware from 3.71 to 3.80 on 21st Dec 2024. Followed the proper procedures including updating HX Edit to v3.82, took full backup, run the firmware update, did a factory reset, and restored from backup selecting everything except the "Factory" setlists and included my setlist which goes into the third setlist slot, originally called "USER 1" but now called "MART 1".
Have been using the HELIX regularly since then without any modifications to any presets. Haven't even run HX Edit. Then suddenly today 8th Feb 2025, the contents of my "MART 1" setlist has been overwritten with the contents of "FACTORY 1" setlist. A restore from backup saved the day but if that happened during setup for a gig, then I'd be really stuck.
As a precaution, I'm planning to copy the entire "Mart 1" setlist to "USER 2" and "USER 3" so I should have a backup on the device but it will be a nuisance to have to keep them all up to date. It appears that there's a glitch here on startup.
