03/2025 - The app lacks basic settings like DNS server or IPv6 firewall, which have been standard on every router I've used for the past 5+ years. I called them on Monday and asked them to replace the router with something normal because I can't do my work with it (I run a home server). They said they'd replace it with a Fritz!Box.
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update :
Today I called 13888, afterwards was possible to run a home server using Speedport Plus 2, they alter some settings and restart the router remotely, duration ~5min.