I also tried to solo mine withe my A2 Mini, but with the cgminer 3.9.0 that comes with the device it is not possible to do this successfull. I used the cgminer just in text mode, not the webinterface. And i know how it should work, because I solo mine with other miners without problems. As far as i know there's just one cgminer version for the A2 Mini's, because they never released the drivers for the device to the public. Seems we will have no chances to mine solo...