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RTOS/CC2640R2F: two CC2640R2F can not pair with each other?

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2540, CC2650, LAUNCHXL-CC2640R2

Tool/software: TI-RTOS

when i use two CC2640R2F ,they can not pair with each other, whatever which one i chose as the master or the slave,but when i use CC2540 as master and CC2640R2F as slave ,they can pair,or use CC2540/CC2650 as slave and CC2640R2F as master can also pair successfully,i do not known why,someone can help me ?