What is bootstrap actually doing

fishacura

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As part of a procedure I am writing for rooting and flashing roms, I wanted to include what the bootstrap ap is doing.

My understaing is I can power up my phone and hold down the volume keys to get to the setup menu. Why couldn't I just do that and pick the sd card .zip file that way?

Bootstrap ap has me click 2 buttons. I know the second brings me to the boot menu, what does the first one do and why do it this way versus manually as I describe?
 
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