How to extract .bin/hdr from Dell Inspiron 660 BIOS (A13)?

Link for the BIOS from Dell:
(sorry for not posting a direct link, this is my first post ever here and it appears I need minimum 3 posts before being able to post links myself)

This is my first post here since I’ve seen some posts from the past where people managed to dump their BIOS. My reasoning for getting those files is to downgrade my BIOS version (since upgrading my PC has been feeling slower) and I need to patch/disable CFG_LOCK from the BIOS.

I have tried a bunch of different tools but to no avail.
Any help would be appreciated, specially in how to do it myself since I’d love to have that knowledge.

Thanks in advance!

Double click and it unpacks in the Windows temporary folder.