Technically you can, but if you do so, you'll have to do it again after the next OTA.
But there are "drivers" that can be seen as blobs ; those are provided by the manufacturer and cannot be changed because are tied with the hardware.
If you're thinking about fixing your wifi problem like this, I think it won't work.
You problem is probably hardware related given that other OPO users don't have the same behavior.
Maybe it is a bad memory sector and flashing UT again can fix it, but I think you already tried that and it didn't help.