*This question covers early Samsung ROMs if your ROM looks like this example `G930FXXU2EREM_G930FOJV2ERE8_TUR.zip` then see [this updated question here](https://android.stackexchange.com/questions/202491/what-do-the-numbers-and-letters-in-the-samsung-firmware-mean)*

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I'm guessing the first 5 letters/numbers are for the model of the device `I8160XXLL2`, but what after that? Is there any guide to understand what exactly they mean by these letters? I'm confused it seems sometimes they repeat the model of the device twice?

    I8160XXLL2_I8160QXXL3.zip
    I8160XXLL2_QXELL3.zip