Convert uint8_t array to ascii character for serial transmission
You don't "convert" anything. A character is just a human representation of an 8-bit value. 

Instead you just need to change what the compiler thinks the data represents (from a human perspective).  The simplest way of doing that is to either cast the uint8_t values to be char values, or to write each one individually as a raw value.

The latter way:

myBluetoothSerial.write(myData[0]);
myBluetoothSerial.write(myData[1]);
myBluetoothSerial.write(myData[2]);
myBluetoothSerial.write(myData[3]);
myBluetoothSerial.write(myData[4]);
myBluetoothSerial.write(myData[5]);


Or, with a loop:

for (int i = 0; i &lt; 6; i++) {
    myBluetoothSerial.write(myData[i]);
}


or using a built-in variant of write that does the loop for you:

myBluetoothSerial.write(myData, 6);