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I have, for example, downloaded an update from android 4.1 to 4.2. All it consisted of was 10 new system apps, 5 libraries, 3 fonts, and a new bootanimation.

What I would like to know is if an update from 4.2 to 4.4 could be done as simply, like by changing out some system apps and/or libraries?

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    updates usually provided by manufacturer only therefore no unlocking required
    – alecxs
    Commented Jan 28, 2021 at 12:14
  • AVB and dm-verity support were added in android 4.4. I don't think your device has integrity protection. You can flash custom images.
    – defalt
    Commented Jan 28, 2021 at 16:42
  • @defalt I know that the boot and recovery images require a signature but I have root rights and have previously modified /system a lot.
    – stoneAge
    Commented Jan 29, 2021 at 13:10

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KitKat has introduced SELinux therefore you can't just update by changing out some system apps and/or libraries.

Nevertheless, while this is a broad statement you may succeed for updating single apk files.

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