Hi,

Regarding of your question, you can follow this steps:

1. **Wipe the contacts of the cleaning liquid tank**:
- Open the cleaning liquid tank and use a clean cloth to gently wipe the two contacts inside the cleaning liquid tank to ensure that there is no dirt or residue affecting the connection.

2. **Power off and restart the base station**:
- Unplug the power adapter of the base station and completely power off for 2 minutes. You can wait during this period to ensure that the base station is completely stopped.

3. **Power on again**:
- After 2 minutes, plug the base station power adapter back in and turn on the power.

4. **Reinstall the cleaning liquid box**:
- Reinstall the cleaning liquid box, make sure it is installed in place, and check if there is a sound prompt.

5. **Observe the prompt information**:
- Observe whether the device still prompts "Installation failed".

If the problem persists, please contact the maintenance center (support.na@dreame.tech), and we will arrange for after-sales maintenance and inspection of the base station for you.

Thanks,  i didn't see your message before,  but thank