Hello Dirk,
As I said, I am happy to help, but I am afraid that I need a little more to go on. So, starting at the beginning, you said that you did a firmware upgrade, to which version did you upgrade to? Also you are saying that
Cuety keeps loosing the router
, I think this means that whenever you startup your unit it pops up somewhere on a screen and then disappears after a few second, it this correct? If so, then it sounds to me like this is still an IP address problem. Could you verify that the IP address of the system that sees the LPU for the few seconds is in the same range as the LPU itself (the first 3 numbers should be equal, the last should be different).
The system that you use to check whether the LPU comes online, is this an iPad? If so, could you try the vManager/Cuety programmer from a PC (mac/windows/linux) and check whether you can see the unit from there?
Alternatively, you can give the store where you bought the unit a call and ask them whether they can help debug your setup. This might be a little faster, however, feel free to continue this discussion here on the forum.
Best regards,
Jurrien