Updating the Baofeng DM-1702 firmware requires specific, version-matched CPS software from the manufacturer and a direct USB connection to the radio while in DFU mode, which is activated by holding the # key during power-on. Mismatching firmware versions can render the radio inoperable, with alternative flashing tools available for users via GitHub. For more details on the tools, visit GitHub . DM-1702 bricked after firmware update - Two Way Radio Forum
Firmware updates carry a risk of "bricking" your device (rendering it unusable) if done incorrectly. Proceed at your own risk. This guide is for educational purposes only. baofeng dm1702 firmware update
Before you begin, ensure you have the following hardware and software ready. DM-1702 bricked after firmware update - Two Way
Remove the battery and look at the PCB (Printed Circuit Board) inside the battery compartment. If you see a large chip labeled "STM32F405," you have a V2. If you see a "BK4819" or unlabeled main processor, proceed with extreme caution—stick to official Baofeng updates only. Before you begin, ensure you have the following
Hold the '#' button while turning on the radio to enter DFU mode.
Often uses "L" series firmware (e.g., L05.01.004) and typically requires Retevis RT72 programming software.
Open the firmware upgrade tool within your CPS and select the correct file.