How to reset BIOS password on HP Probook 4740

My son blocked BIOS with administrator password and now I can't logon to BIOS and change boot order. Tried to register at support, but h20565.www2.hp.com timed out from my place. Please, inform me, how to pass password recovery procedure and reset password? Son forgot password and we can't boot from any other device, but hard drive. If Windows will broken, we can't recover it by boot CD. Please, help.

Inima.
There are no master passwords for EliteBooks or ProBooks.
Contact HP Support.
OR
Replace the BIOS chip.
http://www.ebay.com/itm/UNLOCK-HP-PROBOOK-BIOS-PAS​SWORD-CHIP-4340s-4440s-4540s-4740s-4710s-6470b-657​...
Sorry.
REO
HP Expert Tester "Now testing HP Pavilion 15t i3-4030U Win8.1, 6GB RAM and 750GB HDD"
Loaner Program”HP Split 13 x2 13r010dx i3-4012Y Win8.1, 4GB RAM and 500GB Hybrid HDD”
Microsoft Registered Refurbisher
Registered Microsoft Partner
Apple Certified Macintosh Technician Certification in progress.

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