If fails to read VAG DL501 gearbox TCU with foxflash, check if bench box is connected.
It cannot read if not connecting bench box.
Foxflash reads/writes DL501 TCU no problem, check
http://www.pcmtuner.org/foxflash-read-and-write-porsche-dl501-gen2-gearbox/
PCMTuner also read/write DL501 gearbox without issue.
For example:
Audi A6 TCU Dl501 read and write with PCM tuner success
