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Lenovo Ideapad Z570 BIOS password help

uziel

Broken In
Hello, I have Lenovo Ideapad Z570, the moment i strike F2, password prompt come and i dont have the password. I tried many password software, it executes successfully n after reboot I get a Checksum error, then I press F2 again to get the same password prompt, I cannot get through it, it looks its a supervisor password, any help.
 
OP
U

uziel

Broken In
no i did set it, but never needed it for almost 2 years now and now I forgot.

can removing cmos battery help but i heave heard in lenovo passwords are saved somewhere else?
 
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