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I have heard of Custom ROMs and Custom Firmware, are they the same thing? If not, whats the difference?

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up vote 4 down vote accepted

It's probably the same thing although ROM is supposed to be the area / location where stuff is only ever written once (during manufacture / initial flashing).

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Here's a little more detail that I found: The ROM or Read Only Memory is the internal flash memory where the core operating system resides. The Firmware is a device specific part of the ROM that controls various hardware components. So the firmware is contained in the ROM but in the context of Android the terms are often used interchangeably. – Matt Dec 21 '10 at 20:49

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