Bluetooth Classic V2.1 versus Bluetooth LE V4.1

I have a simple doubt :

When I power up a HC-05 that is already paired with a WIN-10 laptop I am able to send and receive serial data to the assigned COM port from a serial terminal like RealTerm.

But when I power up the Adafruit Feather BLE < Adafruit Feather M0 Bluefruit LE : ID 2995 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits > that also is paired with a WIN-10 laptop, I am unable to send or receive any data using RealTerm. In fact the Blutooth link LED on the BLE is not even glowing . The Feather board is running a basic UART code .

What am I missing ?

Is the laptop really BT4? Some BT4 devices will not work with BT2.