chubbspet:
RESET, the reset PIN of module, inputting low level can reset the module,
when the module is in using, this PIN can connect to air.
Sounds like the typical HC-0x gobbledygook. At a guess, it means that grounding the pin resets any changes to factory default, and it is left disconnected in normal use. I don't think this problem is ever-present, I'm sure you don't need to touch pin 11, and I don't think there is anything to be done to the Arduino. Providing the connection is kosher, it just sends stuff over serial, and the rest is down to Android.