HP ProBook 4510s bios administrator password ????

Hello HP friends
I  have a second hand ProBook 4510s  laptop suddenly when opening it asked me for a Bios administrator password.
while i did't create any password .
so i can't boot to OS or USB or any other external device .
please help me.
thanx

Conos.
There are no master password generators for ProBooks or EliteBooks and most business class laptops.
 If you can boot and still access a Windows OS try this first.
1. HP BIOS Configuration Utility.
  http://ftp.hp.com/pub/caps-softpaq/cmit/HP_BCU.htm​​l
 User guide here.
 http://ftp.hp.com/pub/capssoftpaq/cmit/whitepapers​/BIOS_Configuration_Utility_User_Guide.pdf
 If not then try this.
 2. Contact HP.
 http://www8.hp.com/us/en/contact-hp/ww-contact-us.​html?jumpid=reg_r1002_usen_c-001_title_r0003
 3. Or look at this link.
 http://forums.mydigitallife.info/threads/49497-HP-​Probook-Elitebook-BIOS-Password-Reset-Utility
 Mazzif’s program will detect your UUID, Serial Number and model number then use that information to produce an .exe file to clear the password.
 If you find it to be too technical then.
4. Replace the BIOS chip.
 http://www.ebay.com/itm/HP-Probook-4310s-4410s-4510s-4710s-6440b-6445b-6540b-6545b-Bios-Chip-No-Pass...
 If you have good soldering skills order the BIOS chip. You will receive a picture of the chips location after purchase.
 REO
 I must inform you that these services are not endorsed by HP, and that HP is not responsible for any damage that may arise to your system by using these services. Please be aware that you do this at your own risk.
HP Expert Tester "Now testing HP Pavilion 15t i3-4030U Win8.1, 6GB RAM and 750GB HDD"
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