such as version 7.5.1, which corresponds to these older root methods. Installation Steps for Android 4.4.2
(API level 21). Magisk Manager cannot run on Android 4.4.2 because the underlying root system and module framework depend on features that don't exist in KitKat.
This works for 99% of KitKat devices.
A: Yes, if your bootloader supports fastboot: fastboot flash boot magisk_patched.img . But TWRP is safer.