If you dont use the quick access patch you can only install patches 1 time.
Without it you have to re flash the main so you loose the previous patches. (the bypass procedure without the QA destroys the main so you have to re flash it)
If you are applying the QA patch to a new FW flash you have to go through that process. After you patch it with QA you wont have to reflash the main every time and loose the previous patches or do the remove battery 3 times or what ever it was..