If the laptop failed to update, I do not think anyone here will be able to help you recover it. You will have to contact Toshiba to see if they have a way to restore it(The bios rom data NOT the system it self).
The problem is that when a flash does not finish, the data in the flash rom chip has in most cases already been erased to install the new data.
In this case after a power loss(shut down without finish), without the BIOS, the computer does not know what to do(The bios tells it how to do its thing). On a desktop sometimes you can recover with a CD or Flash drive, but since this is a laptop, I do NOT even know if you can.
Sorry for the BAD news