The x20 v4 have had a new firmware which has enabled the VPN Server option along with many other options as well.

Deco X20(US)_V4_1.1.0 Build 20230517
Published Date: 2023-05-19 Language: Multi-language File Size: 30.31 MB

New Features/Enhancements:
1. Support for customizing Satellite Deco signal source.
2. Support for customizing Clients connection preference.
3. Support for Reboot Schedule.
4. Support for NO-IP and DynDNS.
5. Support for setting Effective Time and Bandwidth Limit for guest network.
6. Added Smart DHCP switch under Access Point mode.
7. Added an alert in the App when the main Deco and modem negotiation speed is only 10/100Mbps.
8. Added VPN server/client features, including Open VPN, L2TP VPN and PPTP VPN.
9. Added the static route function.
10. Added the ability to customize the MTU.
11. Added IOT network function.
12. Added SafeSearch function and Youtube Restrict function in the Homeshield.
15. Optimized the Homeshield function.
16. Improved system stability.

Why does x20 v2 not coming up with an update ?

Deco X20(US)_V2_1.1.4 Build 20221115

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Published Date: 2022-12-28    Language: Multi-language    File Size: 23.84 MB
Improvements:
1. Optimized the stability of wireless backhaul.
2. Improved system reliability and security.

Bug fixed:
1. Fixed the bug of unavailability of satellite Deco's guest network in a specific network topology.
2. Fixed the bug of low upload speed in some scenes.

Notes:
1. Please update your Deco APP to the latest version for the new features.
2. If there are other Deco models in your Deco network, you may miss some new features till other models release updates in the near future.