How to Update Firmware on Retevis RA89 Walkie Talkie ?

The problems that can be solved by Updating this firmware: 1. Add transmission tail tone; 2. Fix the problem that channel storage is not consistent with description in user manual. 3. Add “Mic Gain“ menu option on both RA89 walkie talkie and programming software. 4. Add the the sidekey functions of long press and short press on programming software. The steps to upgrade firmware： 1. Connect RA89 walkie-talkie and computers by programming cable ; 2. Enter update mode: In the shutdown state, press and long hold the PTT button to turn on the radio and enter update mode. The word “update” will appear on the screen. 3. Open the update application““, check the computer’s data port and make sure it matches the software. 4. Then click “open“ to select the firmware you want, then click “update“ and wait for the update to complete. Warning : During the update, do not turn off the radio, otherwise it will be damaged.