Navigate to > Support (or Device Preferences/About ) > Software Update .
Open Part 1 with a tool like WinRAR or 7-Zip, and it will automatically combine the remaining parts. Download TOSHIBA 65U7750 Panel K650WD7 LF330 part3 rar
Select or Update Now to download and install the latest version directly over Wi-Fi. Via USB (Official Support): Navigate to > Support (or Device Preferences/About )
If you are looking for a standard software update to fix bugs or improve performance, use the official built-in methods provided by Toshiba: Download TOSHIBA 65U7750 Panel K650WD7 LF330 part3 rar
Multi-part .rar files (like "part3.rar") are common on community repair forums because firmware files can be too large for single-file uploads. If you have already found a specific blog or forum thread: