Generally when a BIOS update fails you need to physically replace the BIOS chip with a correctly programmed chip. It's also possible to remove the chip and reprogram it if you have a PROM programmer handy. For this reason BIOS updates should only applied to fix a known issue with the computer. Probably the only way to fix your laptop is to unsolder the chip and replace it. It would probably be easier to find a used motherboard than to to source a new BIOS chip.
Well, I don't know anywhere around my area that specializes in any type of computing, and is reliable. I was thinking of sending it to Toshiba, but I heard it will drive me out of my pocket by making me spend double the price of the laptop, and it will take over a month. I still thank you for taking the time to help me. I appreciate it.