Bios Mods -The Best BIOS Update and Modification Source

-Manufacturer: ACER
-Model: Travelmate P645-S
-Bios Revision: 1.05
-Bios Type: INSYDE H20
-Bios Link: https://global-download.acer.com/GDFiles...SC=EMEA_27

I need to downgrade my devices bios from v 1.20 to 1.05. I upgraded the device and now battery and performance has dropped. The bios exe file will not permit downgrading.
Files extracted from the 'A4DBH105.EXE' file are Ding.wav, FlsHook.exe, FlsHookDll.dll, FWUpdLcl.exe, H2OFFT-W.EXE, iscflash.dll, iscflash.sys, iscflashx64.sys, platform.ini Vpro.fd, xerces-c_2_7.dll. When H20FFT-W.exe is executed additional files NoneVpro.fd and platforms.fd are created and disappear when closing the application. I've tried editing the platform.ini file to allow force downgrade ect. but ini file must be embedded into the .fd file. Only way I can think of downgrading is by editing the platform.ini file embedded in the .fd or a windows app that will allow down grading but I'm unsure how to do this.
Would be grateful if can anyone assist? 
Thank you in advance

a little loss of performance is normal because intel spectrum vulnerabilities are patched meltdown spectre-will-cost-the-world-30-system-performance accept it and don't waste your time

Hi, thanks for the info. I have time to use and would still really like to downgrade there are other things I would like to edit in the .ini file too. Please can anyone help? Thank you

Does anyone have any experience with INSYDEH20FFT ifdpacker.exe found this web page https://www.win-raid.com/t4631f16-Insyde-H-O-bios-unloc. When running ifdpacker.exe I cannot seem to find the insydewinflash.exe to browse to when using the tool. Are there any master bios users out there that can help?? Thank you in advance.