Hi, I was told the same thing and called HP customer support. I was provided a smc.bin based on my Elitebook 8470p's serial number. I along with the customer support tried and tried my PC didn't bulged. I followed his instructions over the phone as well tap Windows button and arrow up and down buttons at the same then press f10 but no, nothing happened. Please help me. Later they advised I get a new bios chip.
Follow these steps to clear an unknown password for the BIOS administrator:
1. Save the attached SMC.bin file to a blank USB key. 2. Shut down the notebook. Insert the USB key into any USB port. (If this notebook has both USB 2.0 and 3.0 ports, use a USB 2.0 port.)
3. Press and hold the following three keys at the same time:
the Windows key (near alt) , the Up-Arrow key, and the Down-Arrow key
4. Click and release the power button
5. Once you see a grey "SMC Command" screen, release the three keys mentioned in step 3. (Note: Steps 3, 4, and 5 signal the BIOS of this notebook to examine the USB ports and the HP_TOOLS partition for an SMC.bin file, and if it detects one, to run its command. This SMC.bin file contains the command to allow access into the BIOS as a BIOS administrator without supplying a password.)
You should see something on your screen
6. Read the grey screen about "SMC Command":
6a. If you see a message "SMC Command failure", contact HP support and attach photo of the F1 System Information screen.
6b. On the other hand, if you see no "SMC Command" message of any sort, try steps 3, 4, and 5 again, using a different brand and smaller capacity USB key. If that does not succeed, contact HP support
6c. If you see a message "SMC Command success", then the command has worked. Follow the on-screen instructions and restart the device. Begin tapping the F10 key (or the Esc key) like tap-tap-tap during start, so that the machine will go into the BIOS setup screen. (For this boot only, the machine should let you enter Setup without having to supply an administrator password. If the unit is restarted without performing the next step, the process will need to be ran again).
7. From the File screen in the BIOS, highlight and select the option to "Reset BIOS Security to factory defaults". (This will clear the old unknown password.) Follow the prompts, and restart the notebook when prompted. Reminder: if this notebook uses BitLocker, please choose to NOT reset the TPM!
8. If you wish to set a new administrator BIOS password, you may do so on a future boot cycle by pressing F10 and setting a fresh BIOS admin password within the BIOS setup screen. If there is any difficulty, particularly at steps 6a or 6b, contact HP support