Is it possible to reset the system password? Getting E0271.

[knightclaw]

Got an old A21p and planning to let my son use it.

Remembered the 1st password (I think this is the disk because the icon looks like a drum on the lower left corner of a LOCK ICON) and accepted.
And then I got the E0271 error message. I have an impression of the second password (I think this is the system password because it has on old MAC computer icon instead of the drum) but cannot get it to work. Tried a lot of different variation of it and still it does not work.

It would be great if there is any solution to reset the system password so my son would not want to play with my new T42p.

Thanks.