Third solution for "lost" BIOS password
One trick I use is whenever the client wants the BIOS password enabled I copy it onto a post-it and put it inside the system. This way it is available in an emergency. Clients are always losing the motherboard manuals which we inform them are valuable and must be saved. They don't listen. With this trick we can gain access to the BIOS with relative simplicity. If the client changes the password after our note is installed then we are already inside the computer to mess with jumpers or battery depending on the motherboard.