Basically, you can always also try out RDA devices, and I'm sure you'll get the error coming. Also when wiping out device, to remember to format all memory locations, including memory cards etc.

I have seen the UID changing causing nice small problems when you forgot to change all necessary parts relying into the UID, so basically if you have spend 2 months not doing the necessary testing, and just thought that store is wrong, then you can be rather certain that you will not get enywhere.

So please try what has been suggested, and I'm sure you'll find what is wrong in there.