Acer Aspire M3985 Service Manual page 97

The following table shows the settings of the 3-pin E51 jumper. Place the jumper cap on pins 1 and 2 to Enable
Protection. Place the jumper cap on pins 2 and 3 to Disable Protection.
Jumper Type
E51 3-pin
Chapter 5
Description
BIOS write 1-2: Enable
Protection
2-3: Disable(default)
Setting (default)
89