Android 6, Authentification Issue With Ble Device, Access To The Linkkey Bits

I've got an issue about android 6 and BLE compatibility. My app initiate a read request on a protected characteristic which launch the pairing display to enter the appropriate pass

Solution 1:

Known bug in 1.4.0 of Ti BLE stack got fixed in 1.4.1:

Fix for CC254x host Bond Manager setParam configuration does not support M/S LinkKey enc exchange