Acer Aspire V7-581 Service Manual page 79

10. In DOS mode, input unlockHD XXXXXXXX (Where XXXXXXXX is the backdoor key;
example here is 93653358). The exe will generate an backdoor password(example
here is 22731998).
Figure 2-23. Getting backdoor password
11. Power on the system with the locked supervisor password.
F2
12. Press during boot to enter BIOS Setup Menu.
13. Under Security, select Set Supervisor Password and input the backdoor
password (example here is 22731998) to clear the Supervisor password.
Figure 2-24. Enter backdoor Password
NOTE:
NOTE:
If BIOS Security menu item Password on Boot is set to Enabled, the
Supervisor Password can only be cleared by the Crisis Disk Recovery
procedure. (The default parameter of Password on Boot is set to
Disabled.)
System Utilities 2-19