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Today I got Android ICS update. The system shows version "Ice Cream Sandwich MR1". I know alpha, beta, rc, rtm, etc. but I was wandering what MR stands for.

user802421
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4 Answers4

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I think it means Maintenance Release 1.

Source: I just heard it somewhere on a different application using MR in their version.

sinni800
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    An example from the [Android docs](http://developer.android.com/about/versions/android-2.3.4.html) which confirms it: *"Android 2.3.4 (GINGERBREAD_MR1) is a maintenance release"*. – TachyonVortex Apr 29 '15 at 14:09
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mr = "maintenance release", fr = "factory rom".

JBQ

(via "Kernel suffixes," Android Building mailing list)

JBQ is a former tech lead of the Android Open Source Project.

Dalinaum
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2

It could also mean Manufacturer's Release. As in this is the release your Manufacturer did, in this case Google. Motorola would have a completely different MR1 release in this case.

sinni800
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1

MR is maintenance release while SMR is Security maintenance release. To keep the phone secure and bug free, ODMs generally provide updates.

user15319520
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