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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

They are Technically same,both have custom effect with respect to original firmware.

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Firmware is a term which has no clear meaning in Android world. If ROM and firmware and OS are the same thing, can one be upgraded without the other? – Firelord Jan 29 at 11:55
may be your android world needs to be updated..check this out and one thing more it just glimpse i can't put lot here but firmware in simple meaning is pre installed software in the devices. and for the discussion of custom here point out to manual customization to it. hope this helps. – Mohit Dixit Jan 29 at 13:56
I speak what is available from Cyanogenmod's wiki:… – Firelord Jan 29 at 13:57 this will help to understand that CyanogenMod is perfect example of custom firmware with respect to firmware that google releases for android devices. – Mohit Dixit Jan 29 at 14:10
The link you used doesn't clearly say what is a firmware. Those terms may be interchangeable, may be not. There is no clear meaning of firmware in current Android ecosystem. That's all I said at first place and you've not given anything concrete than mere opinion, but the same can be said for my defense as well. I'm not convinced by your answer and it has my vote showing the opinion. Let's halt the endless discussion for now. – Firelord Jan 29 at 14:14

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