In the XDA forums, bounties for specific goals have a long tradition. I'll give it a try here:
The TIM Hub Technicolor DGA4132 is a very nice device based on the BCM63138 SoC with a beefy CPU, impressive WiFi and a very good VDSL modem that even supports Vectoring and the 35b profile (this combination is called Supervectoring in Germany). It comes with a modified Chaos Calmer preinstalled, up to the firmware version 1.10 (the newest one that was observed preinstalled) a Downgrade and then Root exploit publicly exists.
I for my part pledge 50€ to the first person to achieve unmodified OpenWRT of the newest version working with all features except for the telephone jacks, that I don't need.
I am the administrator of a German Telegram group t.me/DGA4132_deutsch about this router with currently 79 members. For convenience I list and keep track of pledges of other members:
4 * 25€
1 * 50€
Current total: 200€