You must ask toshiba what processors THEIR bios supports. Then, you can select from those processors. And, this is only possible if your current processor is NOT soldered to the motherboard.
An upgrade processor must be socket, chipset, and BIOS compatible.
If a bios update is required, the bios will have to come from - drum roll - toshiba.
And, if a bios update is required, it MUST be done with the existing processor.