Firmware updates are fickle things.
For instance i updated my Yoder to the latest update which improved a lot of things significantly.
If i had just bought the unit i would be very happy with the new update as it held temperature better ect ect ect
what i found was that i was so used to the "nuances" of the old firmware (and im talking very early one) that i had to re-learn how to cook on it.
Its kind of like driving a classic car, you learn how it acts and adjust for it, maybe not as much throttle till it warms up, you match the revs to change to 2nd gear, you make sure to check the coolant every week ect because you know it has these problems but when you adjust for them they are more like personality.
dont update unless there is a feature you cant do without as you risk having the re-learn the pit