Once you have downloaded rkdumper and placed it in your platform-tools folder (or added it to your system PATH), you can use it via ADB.
If you are looking to secure a to backup your device's firmware or explore its partition structure, this guide will provide a comprehensive overview of what the tool does, how to use it, and essential safety precautions. What is Rkdumper? Rkdumper Download
What (tablet/TV box) are you trying to dump? Is your device already rooted ? Are you doing this for backup or to unbrick a device? Once you have downloaded rkdumper and placed it
Rkdumper Download: Your Complete Guide to Firmware Dumping and Analysis how to use it