The installation process is known as "Flashing" or "Burning." You cannot update the 5S via a standard OTA (Over the Air) menu if the system is corrupted. You must use a PC and a USB-A to USB-A cable (rare) or a microSD card.
The is a classic double-edged sword. When done correctly with verified files, it can bring a "dead" box back to life and improve performance. When done wrong, it turns your $150+ streaming box into an expensive paperweight. evpad 5s firmware install download
Finding legitimate firmware files can be difficult as manufacturers often host them on private servers or Chinese file-hosting sites. The installation process is known as "Flashing" or "Burning