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OpenWRT is a OS for Router to free them.
The problem is the closed proprietary software for rouuters including malicious backdoors or spyware for each financially potent customers around the world. The goal of losed proprietary software is only to satisfy the customer in such a way that the dependence of the customer on the manufacturer is drowned out by superficial features.
Community driven OpenSource software is free of such kind of dependencies. With community driven OpenSource software you will use technology and not that technologies uses you.
You are a free user, so use free software.
VDSL2
It is a hard way of to open new hardware because most manufactures are silent and obscure or obstruct enlightenment.
OpenWRT lists on 2020-10-18 the following hardware on https://openwrt.org/toh/views/toh_modem_supported and say that all Lantig based modems are possible to free.
There is no hardware among the candidates, so you have to look in the second hand portals.
| Brand | Model | exclusion criterion I | exclusion criterion II |
|---|---|---|---|
| Arcadyan | VRV752DHW22 Vodafone EasyBox 903 | CABD, NADDD | |
| Arcadyan / Astoria | VGV7510KW22 (o2 Box 6431) | CABD, NADDD | |
| AVM | FRITZ!Box WLAN 3370 | TFFTU, COIS, DTF | |
| AVM | FRITZ!Box 7490 | TFFTU, COIS, DTF | |
| BT | Home Hub 5 | signal problems | |
| BT Openreach | VG3503J v1 | not found | |
| BT Openreach | VG3503J v2 | not found | |
| TP-Link | TD-W8980 v1 |  | DTF |
| TP-Link | TD-W9980 | | DTF, UTFSF (5GHz) |
| ZyXEL | P-2812HNU-F1 | not found | |
| ZyXEL | P-2812HNU-F3 | not found | |
| TP-Link | VR200v | | DTF |
| AVM | FRITZ!Box 7360SL | TFFTU, COIS, DTF | |
| Alpha Networks | ASL-56026 | not found | |
| Netgear | DM200 | | BBE |
| TP-Link | TD-W8970 | | DTF |
| Arcadyan / Astoria | VGV7519KW | not found | |
| Arcadyan / Astoria | VGV7519KW | not found | |
| AVM | FRITZ!Box 7362SL | TFFTU, COIS, DTF | |
| AVM | FRITZ!Box 7412 | TFFTU, COIS, DTF | |
| AVM | FRITZ!Box 3390 | TFFTU, COIS, DTF | |
| TP-Link | VR200 | | DTF |
| AVM | FRITZ!Box 7360 | TFFTU, COIS, DTF |
- CABD : coercion and bondage device
- NADDD : nebulous and dubious device denotation
- TFFTU : trend from free to unfree
- COIS : complex obsurce internal setup
- DTF : difficult to free
- UTFSF : unable to free significant features
- BE : big blind elephant
And the winner is the Netgear DM200, a VDSL Modem. You can free it very simple and config via OpenWRT.
Sometimes, the leading monopolistic telecommunication company is like a big blind elephant without eyes for small animals like a mouse. The BBE in Germany prohibits ANNEX-A and only allows ANNEX-B. It is unimportant on VDSL (see mkresin on https://forum.openwrt.org/t/td-w8970-vs-td-w8970b-difference-in-hardware-or-just-software-firmware/7047/2 ). I will test ist 
.