The Samsung Galaxy A9 Pro (released in 2016) was a powerhouse of its time, boasting a massive 5,000mAh battery and a vibrant 6.0-inch Super AMOLED display. However, Samsung stopped official software support for this device years ago, leaving it stranded on older Android versions.

To install a custom ROM, you must transition your phone through three main phases: unlocking the bootloader, installing a custom recovery, and flashing the new firmware. Phase 1: Install TWRP Recovery

Power off your phone. Boot into by holding Volume Down + Home + Power simultaneously until a warning screen appears, then press Volume Up .