Use Opa to do what you need to from the repository. You could use Daz's loader too but you would have to download all the certificates. The certificate you are probably looking for is the TOSHIBA-XXXINV one in Opa. Try that, should work. TOSHIBA-TOS.INV is the one I had to use for my Satellite laptop. You could use the SLIC dumpkit to see what certificate you may need to use as well.