Unlike a Baofeng UV-5R, you cannot just load firmware over USB. The DM-1702 needs its updated before any custom firmware will stick.
Ensure your radio is communicating with the PC. baofeng dm1702 firmware update
: Users have found that standard firmware files often fail to load; specifically, files like fw_2.2.22-decrypted.zip are frequently necessary for a successful flash. Unlike a Baofeng UV-5R, you cannot just load