...
If the DSP parameter of the phone without with "D", thenĀ
UC926U/UC926S/UC924U/UC924W/UC923U/UC921U need to upgrade the fw920U.romĀ
...
...
If the DSP parameter of the phone without with "D", thenĀ
UC926U/UC926S/UC924U/UC924W/UC923U/UC921U need to upgrade the fw920U.romĀ
...