Some brief searching led me to this Youtube video that shows that some laptops (and this is a Toshiba in the video) have open points on the board that can be jumpered (connected with a wire) to clear the password. If your laptop has these points exposed like such in the video give it a try.

I have not tried it myself but worth a shot.

Forgotten Supervisor password

A forgotten Supervisor password will prevent access to the ThinkPad BIOS setup utility. To regain access, the system will need to be serviced to have the system board and hard drive replaced. Proof of purchase is required, and this repair is not covered under the warranty.

I think you should take a look at these links : http://support.lenovo.com/en_US/detail.page?LegacyDocID=migr-59377

http://www.tomshardware.com/forum/67551-35-method-reset-bios-password-lenovo-motherboard

http://www.helpowl.com/q/Lenovo/B570/Reviews,-Ratings-and-Opinions/bypass-bios-password-lenovo-b570-laptop/196908

Unfortunately, there is no way to bypass the BIOS password of your Lenovo computer. This is set by the manufacturer to create security feature in your computer. However, the best thing you have to do is not to set any password in the BIOS if you don't need that security feature. You may only set your BIOS password if you believe that there are other people who might access you device without your permission.