Connect HC-06's VCC pin to 5V pin of Arduino.
    Connect HC-06's GND pin to GND pin of Arduino.
    Connect HC-06's RXD pin to pin 2 of Arduino.
    Leave HC-06's TXD pin unconnected (or connect to pin 8).
    Upload hc06reset.ino sketch.
    The program will set HC-06 into 115,200 baud mode (AT+BAUD8).
    Use your recovered HC-06 module as before.