2. Remove the battery pack and AC Adapter.

3.Remove the backup battery (RTC) for 20 minutes or use a screwdriver to touch the backup battery (RTC) for 1 second.

4. Put back the backup battery (RTC).

5.Power on the computer and wait until POST ends.

6.Verify that the password prompt does not appear.

ŸSupervisor and HDD passwords:

The Supervisor password and Hard Disk password

(Hard Disk1 and Hard Disk2) are security features

that are used to protect the system and the hard disk drive data from unauthorized access. No overriding

capability is

provided, so it

cannot be

replaced if they

are forgotten. If the customer forgets

the Supervisor

password, the

system board must be replaced. If the

customer forgets the Hard Disk

password,

the hard

disk drive must be replaced.

 

 

ThinkPad 390E 21

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IBM 390E manual