Hi Shanling Mod,
I tried this update with my UA2 and I am still getting the crackles and pop on my unit and frequent disconnections on my windows 10 machine. I tried a lot of things including using another cable, connecting directly to the USB C port, using a dock , using USB C-A pass through and even changing my own IEM cables as well. BTW i am using the 2.5mm balanced.
Other than that, I do like the sound signature that the dac provides.. since I cant use it on my pc, these days been using the unit with my Samsung S20 5G and it works fine.
Thank you!