Installing Android KitKat (version 4.4) on a modern Android device in 2021 (or currently) is a complex task that appeals mostly to developers, retro-tech enthusiasts, or those trying to revive very old hardware.
Here is the definitive guide to reviving your dinosaur with Android 4.4.4. install android kitkat v44 on any android device 2021
If your device has TWRP (Team Win Recovery Project) installed, you can use it to flash the KitKat ROM: Installing Android KitKat (version 4
: This is a security layer that must be disabled to allow new firmware. install android kitkat v44 on any android device 2021