@kottes we need a little more information in order to assist. We need to understand whether your issue is a hardware issue or a software issue, so please respond to these questions:
When you insert the sd card that does not function, do the logs indicate the card was inserted? (use logread command to view logs)
If YES to question 1, please post the portion of the log
Post the content of /etc/config/fstab
Post the output of the command: mount
@KAKU Onion does not make that watch. This forum is for the Onion Omega serial of compute modules.
@SKS Once you have completed your Omega2 setup and connected to your Omega2 to home wifi, the access point (AP) you use to connect to your Omega2 is still functional. So if you no longer have access to your home wifi it doesn't disable the AP, so you can still use that AP to connect to your Omega2.
@arcozelo I think it would be helpful to post the schematic of your custom board. Both cables will work with the ethernet expansion so you should check you have implemented per the design guide.
https://github.com/OnionIoT/Omega2/blob/master/Documents/Omega2S Hardware Design Guide.pdf
@markimpgs have you plugged the Omega2+ into your computer USB?
Here is a thread on how you can mock up an ethernet connection without the use of a dock.
https://community.onion.io/topic/1964/omega-2-ethernet-without-ether-dock?_=1632597620423
@markimpgs my guess is this is a power issue but first I would update the firmware to the latest version
http://repo.onion.io/omega2/images/
https://docs.onion.io/omega2-docs/Firmware-Flashing-from-USB-storage.html
@nreyes According to the documentation the Arduino dock uses UART1 to communicate so you need to use ttyS1.
@EERoarEE if you prevent the mt wifi module from loading then wifi should not be enabled. Try editing /etc/modules.d/52-mt7628 and comment out mt-wifi
@proff We've all been there, the only thing that matters is that it now works.
@SKS The Omega platform is both an educational opportunity and a commercial opportunity to leverage the decades of *nix progress. This afternoon I was eating caviar and drinking Dom Perignon on my terrace. All bought and paid for by *nix and more recently by products based up Omega2 based electronic gizmoes.