Hi,
I am running two BBBs via power adapter, and I wanted to test the GPIO 
pins. One of them runs still on the manufacturing OS, the other one is 
up-to-date. Now I wanted to see the GPIO pin values with an oscilloscope. 
While trying to switch the pins on and off on the up-to-date-board via echo 
on/off > <pin> I experienced that the pin I wanted to switch never changed 
state. Therefore I tried to do the same on the other board, thinking that 
it was a software fault. But there I only measured a 50Hz-triangular 
signal, regardless which pin I chose (Even on GND and 5V). Why? What can I 
do to bring both of them back to work?
Thanks!

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