# RN4871 pairing and config errors

I’ve bought 2 x RN4871 and connect them to a MCU at first and FTD1232 3.3v in a second time. My problem is, when I try to find these device on windows 7, I can’t find them. When I try to config then with « \$ » command with promini 3.3v or FTD1232 : NOTHING !! When I replace the RN4871 by a RN42, its working. No I’m wondering if there is a firmware inside these modules, I’m not sure of that or perhaps their are defects. 2 weeks on this problem.

here the circuit

Best Regards

## migrated from arduino.stackexchange.comDec 11 '17 at 13:42

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