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Upgradtion BT Stack1.2 to 4.1


Hi ,
I have upgraded PC windows Bluetooth stack(BT) from 1.2 to 4.1. BT Pairing is working fine when both PC and devices are of 4.1 type.
But when device is 1.2( 4 digit pin), BT pairing is not happening since pairing concept has changed in 4.1( 6 digit). I need the PC side BT 4.1 to accept 4 digit Pin and pair with BT 1.2 devices.

Please guide me how to resolve above issue and any other approach is also appreciated