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What is the meaning of “flashing a custom ROM”?

I have been looking for some good explanations of some words that have been frequently used the android developer communities like the XDA forums.

Some words I've seen but do not understand are:

root - (as far as I know it's the way of getting the super user access)

flash - don't know what this is

ROM - don't know either

I need a more descriptive explanation about these words and the related tools, mechanisms, etc.

marked as duplicate by Matthew Read Nov 20 '14 at 19:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


Looking around the site will give you lots of answers.


ROMs and Flashing:


root - you are correct

flash - is to replace the OS that is installed on your phone with a custom ROM.

ROM - is a 3rd party created custom version of the Android OS.

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