I have an RCA Maven Pro, RCT6213W87-M, and I fixed the “keyboard not recognized” problem by using a q-tip with one end dampened with rubbing alcohol to clean both sets of contacts, then tried it with the other. I had been using the tablet without the keyboard for several months, and I suppose there was oxide buildup on one or both sets of contacts. I thought I noticed the ones on the tablet itself were more reflective after cleaning. HTH.