How to Upgrade Retevis RT76P Firmware

Today, we are going to learn how to upgrade Retevis RT76P firmware.

Firstly, let us check the 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. 

Next, How to upgrade the RT76P firmware. 

1. Download the firmware and software from this link: https://www.ailunce.com/Assets/file/Retevis-RT76P-Firmware-and-Software.zip

2. Install the RT76P_Bootloader.

3. Upload the firmware file. 

4. Choose the com port. 

5. Click "Update" begin upgrade the firmware.