Yes. But beware that doing so is probably multiple man-years worth of effort.

Probably not. In general, this sort of thing is buried in the often unchangeable microcode of an RF ASIC. (Which makes sense, after all, the vendor is selling an RF modem for a specific band/modulation capability - they don't expect it to change, certainly not after they've built/configured it.)

If that's the case (as is common), then there is really nothing to update, short of scraping off that chip or module and replacing the hardware.