Helix Floor: I recommend to do a factory reset after updating to 2.81 in any case!! a month after the update I realized this: switching back from Snapshots to Manual Mode with the Cancel button does not work anymore! Made a global reset(of course with a backup) - works fine again now! did not make the reset after the update... which was a big mistake!!
I have the same issue with a Friedman Runt 50...so its 2018 and it does not work with Marshall Mesa and Friedman... The solution is not buying an extra unit to fix it!! I love the Helix sound wise and for manx other reasons but this is bad!!