Bios downgrade.

Hello everyone. After upgrading to 1.32, turbo boost stopped working. I would like to return bios back to 1.27. How can I do this?

And also in bios 1.27 I would like to update cpu microcode
Acer e5-571g
Intel core i5 5200u
Nvidia 840m

Bios 1.27 https://global-download.acer.com/GDFiles…ACER&SC=EMEA_23