If you have any problems with your BLEFriend module, you can perform a factory reset by entering command mode (set the mode selection switch to 'CMD'), and entering the following command in your terminal emulator:
AT+FACTORYRESET
This will erase the non volatile memory section where the config data is stored and reset everything to factory default values, and perform a system reset.
When you see the 'OK' response the device should be ready to use.