@Vthe111111 

Hello,

Thank you for sharing your experience and feedback. 

Generally, if you replace your Deco main unit and keep the same Wi-Fi name (SSID) and password, your TP-Link devices should automatically reconnect without needing to be re-added.

However, in some cases, they might not reconnect immediately due to cached credentials or other temporary issues. Here are a few steps you can try to resolve this:
1. Restart the devices: Power cycle the TP-Link devices that didn’t reconnect. Sometimes a simple reboot helps them recognize the network again.
2. Check Wi-Fi encryption settings: Ensure that your new Deco network uses the same encryption type (e.g., WPA2/WPA3) as before. A change in encryption can prevent older devices from connecting.

If the issue persists after trying these steps, we recommend contacting our technical support team for further assistance. 

Best Regards.