It is to natively install Symbian OS on an Android phone as a replacement for the Android operating system . Symbian was designed for specific hardware architectures (like old Nokia ARM11 chips) that are incompatible with modern Android hardware.
: Modern Android hardware (like high-res screens and complex GPUs) does not have drivers compatible with the ancient Symbian kernel. Bootloader Restrictions install symbian os on android phone
While you can install custom ROMs (like LineageOS ) on Android, these are still Android-based. Porting an entirely different kernel like Symbian would require: It is to natively install Symbian OS on