| This guide will be covering the steps on how to replace the BIOS chip on a HP Probook 4540s laptop. In order to replace and solder on a new BIOS chip, disassembly of the laptop is required. This guide will cover all steps in order to achieve the replacement. |
| 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. |
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| 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. |
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| 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) are able to remove a BIOS admin password. Only after exhausting all possibilities do we recommend desoldering the BIOS chip from the system board. |
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| Steps 1-21 will walk you through on how to disassemble the laptop in order to perform the replacement. |
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| Step 19 will require you to remove the motherboard 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. |
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| If you have never soldered, we recommend you to read [guide|750|How to solder and desolder connections|new_window=true] to learn different techniques. We specifically recommend step 11, as the BIOS chip is surface-mounted onto the system board. |
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| Good luck! |