Bloutooth module HM12 AT+ROLE command does not work

Projects Networking, Protocols, and Devices
1

Hi everybody,
I both 2 bluetooth module HM12.
All AT commands works except AT+ROLE and AT+ROLB.
So I cannot change one of the module from SLAVE to MASTER.

My goal is to pair two modules and transfer data between them.

Please, help.

George