RT76P Firmware and software update

 RT76P Software changelog:

1. Bandwidth setting: Interstitial channels in the 467 MHz band will fixed to narrow and low power; other channels default to Wide and Wide/Narrow can be adjustable.

2. Release 31-128 channels, can write into the radio.

 RT76P Firmware Changelog:

1. Cancel Preset CTCSS/DCS: Press the "PTT+9" together, then turn on the radio, when hearing " off", the preset CTCSS tones are canceled.

2. Bandwidth setting: Interstitial channels in the 467 MHz band will fixed to narrow and low power; other channels default to Wide and Wide/Narrow can be adjustable.

3. Support 31-128 channels write into the radio.