Upgrade Android 4.4.2 To 9.0 [top] -

Force restart (hold power button 10 seconds). If it loops again, go back to TWRP, wipe data, and reflash. If still stuck, try a different ROM.

Find a stable Android 9.0-based ROM (e.g., LineageOS 16) on trusted forums like XDA Developers. upgrade android 4.4.2 to 9.0

The first boot sequence may take up to 10–15 minutes as the new OS builds its cache. Force restart (hold power button 10 seconds)

Type adb reboot bootloader and press Enter. Your phone will boot into a static screen. Find a stable Android 9

Because official Over-The-Air (OTA) updates from 4.4.2 to 9.0 do not exist, you must use a custom ROM. The most reliable framework for this is LineageOS 16.0 (which is built on Android 9.0) or equivalent custom firmware. Step 1: Unlock the Bootloader

– Android 9.0 is designed for more powerful hardware than what was available in 2013–2014. Even if a custom ROM runs, it may be sluggish, especially on low‑RAM devices. Newer Android versions often require higher hardware specifications, and older devices may not have the required resources to run them smoothly.