This Article Applied to 
Deco X20-DSL_V1_1.0.11 

Problem Description
After updating Deco X20-DSL to the latest 1.0.11 firmware, some users might find the Web Protection, Intrusion Prevention, and IoT Protection functions of HomeShield Pro would automatically turn off shortly after being enabled.

Available Solutions
This issue will be optimized via a future firmware upgrade.

Currently, Please upgrade the X20-DSL to the following beta firmware to resolve this issue.

Deco X20-DSL_V1_1.0.11_Build20230712

Note:

1. Please be sure you have read the Terms and Conditions for TP-Link Beta Firmware before proceeding!
2. You can still upgrade to the official firmware if there is any.

3. How to update the beta firmware-How to Update the Firmware of Deco.