Use the command fastboot oem unlock in a terminal while the device is in bootloader mode to unlock it.
| Device type | Feasible action | |-------------|------------------| | Very old (2012–2014) | Install official 4.4.4 stock ROM or custom ROM (CyanogenMod 11, OmniROM 4.4). | | Devices with unlockable bootloaders (2015–2017) | Some have LineageOS 11 (KitKat) unofficial ports, but not “any device.” | | Modern devices (2018–2021) | Impossible: no GPU, modem, or touch drivers for KitKat. | install android kitkat v44 on any android device 2021
This process requires unlocking your bootloader and rooting, which voids your warranty and carries a risk of "bricking" (permanently disabling) your device. Method 1: Installing a Custom ROM (Rooted Devices) Use the command fastboot oem unlock in a