First use a flat screwdriver to
get unter the keyboard at the green line. Perhaps you have to push in the
small clip (the bottom-left red circle in the left pic) to be able to pull
slightly the keyboard. Now get another screwdriver and push in the small
clip above the ESC-key marked with a red circle. The keyboard should snap
out partially. Proceed with the remaining 3 clips in the same way.
Now turn over the keyboard and
locate the BIOS-battery. It is accessible through the hole marked with an
arrow:
Use a screwdriver to
short-circuit the BIOS battery for 3-5 seconds. The battery is hidden
somewhat right under the metal plate. But you can reach it without removing
any other parts. Look:
Get with a screwdriver between the slit marked with those arrows and short
the golden contact in the front with the battery housing.
Replace the keyboard. Make sure
it snaps into all clips. Now, the BIOS (incl. the password) should be
erased.
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