The older versions can be found here
https://support.hp.com/us-en/drivers/selfservice/hp-15-bg000-notebook-pc-series/10862323/model/15177...
Click on the first one listed and then "Previous version" diamond under the "Associated files heading."
There the older versions will be listed. While it does not say or warn but most times it will not allow an older version BIOS to be installed over a newer one.
I'm not an HP employee.
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