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CC2642R: Bond failed

Part Number: CC2642R

Hi Team,

We are using CC2642 as a peripheral. and we are using simple_peripheral code.

We are using the "simplelink_cc13x2_26x2_sdk_5_20_00_52" SDK. 

1) Whenever I tried to pair with CC2642 by using some android mobile i am getting the following error 

"Error : Bond save failed: 21" in GAPBOND_PAIRING_STATE_BOND_SAVED case of "SimplePeripheral_processPairState" function.

Why we are getting this error ? How to track this error ? It was register as a callback

2) Also we are facing the below error in "HCI_LE_EVENT_CODE" case of "SimplePeripheral_processStackMsg" function.

Error : "PHY Change failure"

Why we are getting this error ?

3) What is the way to avoid these 2 error ?