Acer Aspire 4743Z Aspire 4743 and 4743Z Notebook Series Service Guide - Page 214
BIOS Flash, Utilities, Disconnect the USB storage disk from the computer.
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Performing a BIOS recovery 0 To perform a BIOS recovery: 1. Shut down the BIOS failed-computer. 2. Connect the USB storage disk containing the Crisis Recovery disk files to the computer. 3. Press and hold the keys, then press the power button. The BIOS recovery process begins. When the process is complete the computer will automatically reboot. 4. Disconnect the USB storage disk from the computer. 5. Perform a BIOS flash procedure to update the BIOS firmware. Refer to BIOS Flash Utilities for detailed instructions. 5-8 Jumper and Connector Locations