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Introduction |
| If your HP Probook 4540s laptop has a locked BIOS and you are unable to install an Operating System because you can't access the BIOS settings, then a BIOS chip replacement will solve your problem. | | | The BIOS (Basic Input Output System) chip contains a program that is used to start the computer. In order to install an Operating System onto the computer, accessing the BIOS settings may be necessary in order for the computer to prioritize the CD or the USB flash drive to boot up before other types of data. | | Before using this guide, try other solutions in order to unlock the BIOS chip such as contacting the original owner of the laptop and asking for the password. If you are the original owner, the product manufacturer (in this case, HP) areis able to remove a BIOS admin password. Only after exhausting all possibilities do, we recommend desoldering the BIOS chip from the system board. | | Steps 1-2122 will walk you through on how to disassemble the laptop in order to perform the replacement. | | Step 19 will require you to remove the motherboardsystem board and the following steps will guide you on how to desolder the old BIOS chip and solder the new BIOS chip onto the system board. | | If you have never soldered, we recommend you to read the guide [guidelink|https://www.ifixit.com/Guide/How+To+Solder+and+Desolder+Connections/750|How to solderTo Solder and desolder connectionsDesolder Connections|new_window=true] to learn different techniques. We specifically recommend stepsteps 11-14, as the BIOS chip is a surface-mounted ontoconnection on the system board. | | | Good luck! |
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