Hi @czarsimon
J10 pin 9 is a Voltage for Spektrum Style RC modules that require a power ON/OFF/ON sequence to bind.
GPIO_159 is the GPIO that enables this feature. If held static ON, this is a reverse protected 3.3V pin, up to 1A of support.
6ca43c92-9147-4f70-836d-093ca968c2a7-image.png
83491011-d3ab-4314-8704-5bb92ddfe9d3-image.png
All Board-to-Cable (JST's) connectors are on the DSP since they are purpose designed for Flight Control features.
You'll need to use the Board-to-Board connectors (J3 and J5) for Apps GPIOs.
https://docs.modalai.com/voxl2-connectors/#j3---legacy-board-to-board-connector-b2b
https://docs.modalai.com/voxl2-connectors/#j5---high-speed-board-to-board-connector-hsb2b
Hope this helps!