If you are writing this to encourage users to update, you should also include a "Caution" warning, as BIOS updates carry a small risk if the power is cut during the process.
For modded BIOS (unlock advanced menus, remove whitelist), refer to C50A_Advanced_Menu_v640_mod.bin from BIOS-Mods – but flashing that requires SPI programmer due to signature check failure in official flasher. toshiba satellite c50-a bios update