Unable to find signature file during bios update

[Feystray]

I recently wanted to update my BIOS to F.21.I have ubuntu 20.04 LTS single boot.Using 7z I had extracted the exe file to a pendrive with fat32 format and booted my pc by pressing f9 using "boot from efi" and choosed the HpBiosUpdate.efi from there .But, my Bios isn't updated and shows bios update failed.Here is the log file after booting.

02/12/23 12:17:44 Failed Loading HP Battery Control 2010 Protocol

02/12/23 12:17:44 Failed Loading HP Battery Control Protocol

02/12/23 12:17:44 All Required Protocols Located

02/12/23 12:17:45 Load Options Blank

02/12/23 12:17:45 EFI HP BIOS Update 2.5.2.0 Started

02/12/23 12:17:45 Current Directory = \

02/12/23 12:17:45 SMBIOS Init Success

02/12/23 12:17:45 SystemFamily = 1

02/12/23 12:17:45 Lang reported as eng.

02/12/23 12:17:45 Lanquage Selected is currently (eng).

02/12/23 12:17:45 HP Bios Image Protocol Version 1.0

02/12/23 12:17:45 AC Power Connected

02/12/23 12:17:49 Failed Reading Image File Hewlett-Packard\BIOS\New\68AHH.bin

02/12/23 12:20:28 Failed Loading HP Battery Control 2010 Protocol

02/12/23 12:20:28 Failed Loading HP Battery Control Protocol

02/12/23 12:20:28 All Required Protocols Located

02/12/23 12:20:28 Load Options Blank

02/12/23 12:20:28 EFI HP BIOS Update 2.5.2.0 Started

02/12/23 12:20:28 Current Directory = \

02/12/23 12:20:28 SMBIOS Init Success

02/12/23 12:20:28 SystemFamily = 1

02/12/23 12:20:28 Lang reported as eng.

02/12/23 12:20:28 Lanquage Selected is currently (eng).

02/12/23 12:20:28 HP Bios Image Protocol Version 1.0

02/12/23 12:20:28 AC Power Connected

02/12/23 12:20:31 Failed Reading Signature File Hewlett-Packard\BIOS\New\68AHH.sig