let me start by saying I have very little experience or knowledge about flashing. I am happily flashing Atmega328 chips using the ArduinoISP but nothing further.
I have some HC-05s that I want to try flashing. They appear to use SPI and I thought I might be able to use the ArduinoISP to reprogram them. I have found very little online and the main site that keeps coming up is Byrons Blog at http://byron76.blogspot.hk/search/label/HC05. Byron built a programmer that uses the parallel port on a computer which I do not have.
If you think this is possible what should I be looking in to and how do get the ArduinoISP to use a non Arduino file? To date I have only flashed Arduino sketches to Atmega chips using the Arduino IDE.