Searching for "proshivki" (firmware) can be risky due to sketchy download sites. Stick to these verified sources:

Android 4.4 KitKat might be old, but it isn't dead. With the right firmware, that old device in your drawer can become a functional tool once again.

A firmware for the "Samsung S4 i9500" will brick an "i9505." Be exact.

If your manufacturer stopped updates, these community builds often offer better performance and fewer "bloatware" apps. Where to Download (Proshivki Android 4.4 Skachat)

The original software that came with your device (Samsung, Sony, LG, etc.). Best for stability.

Android 4.4 (KitKat) Firmware: How to Find and Download Stable ROMs