Turn on the laptop and tap F2 repeatedly until "Password =" appears.
While there is no single academic "white paper" officially published by Toshiba on the internal mechanics of their challenge-response algorithm, several technical guides and community reverse-engineering efforts document the process in detail. Core Technical Process toshiba challenge response code generator full
The "Toshiba Challenge Response Code" is part of a security system used to unlock a BIOS password on older Toshiba (now Turn on the laptop and tap F2 repeatedly
Before you can use a generator or contact support, you must force the laptop to reveal its hidden challenge code: toshiba challenge response code generator full