How to rule out errors? Any log possibility?

[Licht77]

Okay after some testing I can update with the following info:

Checked the CPU and its USB cable: no problem visible. Tried direct plugging with a new usb stick (same kingston as the original delivered one) and still get the same behaviour. So I think we can rule out a bad usb stick as well as a bad usb cable.

Additionally, when realising that I am not in defense mode (just green instead of blue) its ok to just powercycle the device (directly via a switch on the power cables) and voila: blue again. That also works when the car is standing still - so I dont think that any component suffers of a broken cable or so.

Any hints are really highly appreciated

[BestRadarDetectors]

If you are using GPS with speed limit settings it will not go into defense mode until after you exceed your speed settings.

Sent from my SM-G935T using Tapatalk

[Licht77]

If you are using GPS with speed limit settings it will not go into defense mode until after you exceed your speed settings.

Sent from my SM-G935T using Tapatalk

Thanks for the info - yes, I am aware of that!

So far I tend to think that its the last 2 or 3 firmware updates that broke my ALP here. To rule that out I would like to revert to a lower firmware - is that possible without problems?
If the problem still exists with - lets say 5.2.1 then its not a software problem... if its fixed then I got a smoking gun...

So - same procedure as with an upgrade, resetting afterwards and ideally using an old config file... right?