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Wait at least 15 to 30 minutes to ensure all power drains from the circuit.
If your laptop is under warranty, it is highly recommended to contact Acer official support. If you attempt to open the chassis, you may void your warranty. Acer technicians can provide a "Crisis Disk" or a specific unlock code if you can provide proof of purchase and the Serial Number (S/N) of the device. Preventing Future Lockouts
Reinsert the battery, reassemble the laptop, and turn it on. The BIOS should be reset to factory defaults with no password required. Using the G36 Reset Jumper
For older Acer models (pre-2015), you can sometimes generate a master password based on the shown on the unlock screen.
This is not your Windows login screen. It appears Windows boots — sometimes even before the Acer logo finishes loading. It’s a BIOS / HDD password prompt , set at the firmware level. Unlike a Windows password, this one is stored on your motherboard or your hard drive’s controller.