Ugh… this is so disappointing. I tried to solder a ribbon cable to the JTAG header of my “development” FritzBox 7270. Right during the process I accidentally bumped against the bare PCB. It fell off the table and the already soldered cables ripped off some of the pads. Here’s a photo after removing the remaining cables:

I’m unsure how to continue. I followed the traces but so far did not find adequate vias or pads to solder to. At the moment I’m trying to not brick the FritzBox and therefore do not need a JTAG connection… again…