MLT-BT05 Bluetooth module

I have two MLT-BT05 Bluetooth LE module (TRM-BT05-V4.0) a mobile phone and a bracelet for fitness “Mi Band 2”. One of the modules is set as MASTER and the other is SLAVE. I can connect the two modules and can change information between them. The mobile phone can find and connect to the SLAVE module and to the bracelet. I don’t know why the MASTER module does not find the bracelet. On the phone is installed an simple software that allow me to find all Bluetooth devices near me.
The MASTER need to connect to the bracelet and get some data from there.
What can i do?

Thank you!