Locate , Transition animation scale , and Animator duration scale . Change their values from 1x to 0.5x or turn them off completely.
If the device gets stuck on the boot animation for more than 20 minutes, boot back into TWRP, perform another factory reset (wipe Data/Cache), and re-flash the ROM.
Since Android 4.4.2 devices are roughly 10 years old, hardware failure is common. If you need Android 9.0 for specific apps, purchasing a newer (even used) device is often more reliable and safer than attempting a manual upgrade on vintage hardware. What is the model name upgrade android 4.4.2 to 9.0
The question is inevitable:
First, verify if your manufacturer released an official update. Most devices from the KitKat era (circa 2013-2014) stopped receiving updates at Android 5.0 or 6.0. Go to Settings > System > Software update . Samsung: Check Settings > About device > Software update . Locate , Transition animation scale , and Animator
A through a custom recovery to save your current system state. 3. Step-by-Step Upgrade Process
Most devices require you to unlock the bootloader to allow third-party software installation. This is usually done via in your settings. B. Install TWRP Recovery Since Android 4
Note: This is a general guide. Steps vary wildly by device model.