Could you please confirm if you have connected HCI UART only?
Please try our CyBluetool connected to the module HCI UART and try sending commands from CyBluetool. CyBluetool (Windows Installer)
If still the module is not responding to HCI commands, please download the module with an empty application as suggested in this thread :
For HCI commands , you may refer to Bluetooth core spec from Bluetooth Sig.