miklor pisze:

The two models have distinctly different band pass filters and other components that determine the available bands. A 150/450 MHz radio cannot be converted to 150/220 MHz using software, and vice versa.

The internal band pass filters will not allow the radio to transmit / receive much beyond their specified range. The frequency range is fixed and is determined by physical components values of the filters, not software.

miklor pisze:

The UV-5R and UV-5RAX are not capable of any reliable operation outside its specified Dual Band frequency range.