It contains the full instruction set for the TV's processor. Technicians use hardware programmers (like the RT809F or RT809H) to "burn" this data directly onto the memory chip. Common Symptoms Addressed: TV stuck on the Hisense standby logo.

If the TV still powers on, you can try accessing the service menu (typically Menu + 1147 or Menu + 195 ) to check for software errors. Hisense Firmware Downloads & Updates | Support

Visit the Hisense Firmware Support site and enter your serial number to see if a USB-loadable recovery file is available.

Unplug the TV and hold the power button for 30 seconds to drain residual power.

This is a high-level repair. It requires opening the TV, desoldering chips, or using ISP (In-System Programming) headers. If you are looking for a standard update, you should first check the official Hisense Support page.