Acer Aspire V7-581 Service Manual page 211

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 5-8. 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 5-9. Enter backdoor Password.
NOTE: NOTE:
If BIOS setup menu item 'Supervisor Password Is' and ' User Password Is'
is set to Set, and 'Password on Boot' is set to Enabled, then Crisis Recovery disc
must be used.
Jumper and Connector Locations 5-7