I had the same problem , frozen on the boot failure entered update mode . I unplugged my helix , deleted all my helix software from my pc reinstalled hx edit 2.80 plugged my helix back in switched it on and waited for the red line to go right across the screen , then updater recognised my helix even though it was showing 2.80 I updated it to 2.80 And hey presto it worked. Panic over . J