How does changing jumper resets password

Question

For resetting bios password we used to relocate jumper and reset it,How does changing jumper helps in resetting password?

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What happens to Bios password while we change jumper ,how does the manual hardware (jumper) relocation changes/resets the password?

score 4 · Accepted Answer · answered Aug 26 '13 at 05:08

It simply wipes out the volatile part of the memory of the bios, leaving a pristine, default set of settings, including an empty password. I believe it does so by disconnecting the power from the bios, which should be the same as removing the battery, and waiting for any residual power to drain out. This is why you need to do so with the system switched off.

score 1 · Answer 2 · answered Aug 26 '13 at 05:24

Removing the jumper breaks the circuit the CMOS needs to retain data. Moving the jumper grounds out any residual charge. After returning the jumper to the original position and powering up, the default settings are restored to the CMOS from the EEPROM that was set at the factory. Some devices store passwords in the EEPROM, in which case moving the jumper will not reset the password (or any data stored in the EEPROM).

How does changing jumper resets password

2 Answers2