How can I restore the latest BIOS version when it doesn't appear in "Software & Drivers" page ?

When delivered, my brand new Pavilion desktop model 500-282ef was equipped with BIOS version 8014.
On the EFI\HP\Bios partition, only the \Current directory contained another version of the BIOS, an older one, namely version 8013. The  \Previous and \New directories were both empty.
Experimenting with my new BIOS, I've unadvertently downgraded my BIOS version 8014 to version 8013.
Now, as you've probably guessed, I would like to restore the latest version
The EFI partition doesn't contain any installer to restore my BIOS to its former up to date version.
Unfortunately, "the drivers and update" page on HP support site does not provide any installer either.
I would be so grateful if some of the nice people here would ask HP to point me to such (probably unreleased) updater which should obviously exist.
I have saved a copy of my second Pavilion desktop BIOS using safawin.exe in the hope I could use it to achieve a restore. But I've been unable to use it to restore the latest BIOS as the restore process also requires a signature file.
Thank you very much for your help!

Yes Dave, that's what I meant: during the "downgrade" from BIOS version 8013 to version 8014, no BIOS backup files were created and I couldn't found anything in any directory of the EFI partition.
In an attempt to solve the problem, I have put manually a copy of the BIOS (v 8014) from my second Pavilion Desktop (same model, same age) in the "\New" directory. That BIOS file was created with the safuwin.exe utility.
That has been a nice step forward: Now, from the Boot page, the Firmware Management offers me the update option ("You will update from 8013 to 8014, OK?") but when I try to so, I got a error message saying that a signature file should also be present along with the BIOS file to flash.
In the EFI\HP\BiosUpdate directory I do see some signature files like HpBiosUpdate.s14 and HpBiosUpdate32.s14 which could be the signature files I need, but I have no idea about how to use them (or maybe rename them?) to allow the procedure to complete successfully.
Concerning the warranty, do you suggest I should invoke it ? Could you please clarify ? Actually my PC has no other problem than this BIOS "downgrade".
I trust that HP has in store all the files I need, which have probably been used when configuring my PC in the factory. My problem is to have these files available in the "Software & Drivers" page on HP site...
Thank you very much for your help. I stay tuned
Twain

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