There is a saying that 40125s can only be upgradeable if it is using ZSxx Firmware.
And for me, I can’t seem to find 40125W (I want to buy it…)
How can I know(I mean when I’m buying) that the frive is using a ZSxx firmware or a XSUx firmware?
And how can I find the 40125W ?
I mean, does the box package say that this is a 40125W or this is a 40125S ?