Remove the battery and to the power cord.
Remove the two screws that secure the keyboard. After removing the keyboard, remove the battery “RTC” to stop providing energy to epprom BIOS. After the upgrade or downgrade, or any repair, leave the Laptop for 5 minutes, without any source of energy.
Then connect only the power cord without battery and without the battery “RTC” of the Bios. then turn on the laptop press f10 change passwords and save changes and exit, put back battery then reconect the rtc battery and done reinstall xp done
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