G500s, Older BIOS Download to facilitate Upgrade to the latest version.

Why doesn't Lenovo make older BIOS versions available for download?
I am trying to upgrade to the latest, but the version I downloaded says it is not for my laptop even though I am on the downloads page for my specific make/model.  Scouring the Internet, I have discovered that there are, in fact, several versions between what is currently on my laptop (v1.05) and the most current version availble for download.
All of the prior versions I have discovered are downloadable, but from other, untrusted, sources.  I would appreciate being able to download them directly from Lenovo in an effort to "roll up" my BIOS, version by verion if necessary, to the current one.
There is a feature that was introduced in v2.02 (locking the Fn key, current is v2.03) that, as a developer and prolific user of debugging tools, would be incredibly helpful for me (I use F10/F11 WAY more often than brightness controls).  It is somewhat ridiculous it was never in prior versions.  (I have a 10-year-old keyboard at my desk that can lock the Fn key, but I'm not always at my desk).
Please do not respond with posts that I don't need this version.  You will not receive any "Correct Answers" this way.
Thank you!
Mod Comment: Subject edited to include model, and for clarification of the issue.

Sking5000, click on the link below for Lenovo Support phone number........
http://support.lenovo.com/us/en/supportphonelist_a​lt1
Owner & Operator of the following:
● Lenovo Ideapad Z570 w/ Win 7 & Win 8.1 Dual Boot ● Lenovo Yoga 3 Pro w/ Windows 8.1 ● Toshiba A75-S206 w/ Win 7
● IBM Thinkpad T-23 w/ Win XP ● IBM Thinkpad T-22 w/ Win XP • As well as multiple desktops dual/triple booting XP, Vista and Win 7.
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