Howto troubleshoot the pioneer FreedomBox ?

The first things I would check is if the microSD card is plugged in properly and if the ethernet cable is not faulty.

Also, this sounds very similar to a problem I had a while ago

You can attach a monitor via HDMI cable and a keyboard to the Pioneer FreedomBox device without opening the case. Login via the usual administrator user that you have on FreedomBox and try to troubleshoot the network connections or apt upgrades as mentioned in the above post.

You can also connect to another computer using a GPIO to USB cable. This is way more complicated than connecting to a monitor via HDMI. I only tried this on Rasberry Pis so far. Have to ask on Olimex forums on how to do this on a Lime 2.