This has been said oft times, but to repeat, the bottom line is:
NOTES:
1. This firmware has significant changes to the core algorithms. While every attempt has been made to ensure compatibility with existing presets it is recommended that the amp block be reset by deselecting and re-selecting the desired amp model to load the new default values and the preset then auditioned and readjusted as necessary.
This is the way on new FW. Ignore the beta, or stay on it if it works for you, however, each time you upgrade, be FULLY PREPARED to rework all your presets if necessary. It's not that way with everyone, but with some folks...yes.
Way of the world folks, stay on earlier FW if it works for you, no shame there. But in the 10 years with FAS, I've never reverted after working with a FW for a bit of time. Unicorn's probably won't boil out of the box without some work...(although many get lucky and it just *works*)
R