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hello try to connect the Acer support or search on Google for bios password. A lot of computer the come with a same bois password that company put on it. For example your Model is Acer may be the Company put Acer password for it . Even if you remove the bois battery from the motherboard and you see same thing again i think you will have to take it to Acer Branch the only help it their. i tried to find the password for you put can't find it. Please rate my comment thanks
Disconnect all power sources, including the battery. Open the laptop and remove the CMOS battery (the little round silver thing). Hold the power button to drain any residual charge for 10 seconds. Boot the computer without the CMOS battery inserted. it should say password disabled. Reassemble the computer and you're done!
If you cannot find the reset pins try to find the CMOS 3V battery, it is usually located under the keyboard, and disconnect it. remove the computer battery and then start the computer. When you boot it should ask you for the time and date. At this point shut down and plug the CMOS battery back in and reinstall the computer battery. This time when it ask for the time and date go ahead and enter it and the rest of the bios should be set to default.
At this time you need to cleat the BIOS password first so that you can get into BIOS. To cleat the BIOS password you need to open your laptop you just remove the battery first. Remove the screw and open the back cover. Locate the CMOS battery, all password are stored in CMOS memory.
Remove the CMOS battery to clear the stored BIOS password, Or you can remove also the CMOS jamper near the CMOS battery and turn on the unit with in 10 second and turn off. Reinsert the jamper. Now the BIOS password are already clear you can get now in BIOS to change some settings. Good luck
Some BIOS manufacturers implement a backdoor password. The backdoor password is a BIOS password that works, no matter what the user sets the BIOS password to. These passwords are typically used for testing and maintenance. Manufacturers typically change the backdoor BIOS passwords from time to time.
BIOS Password Compaq