How to roll back my BIOS from f.63 to f.56

Few days ago, I updated my BIOS to f.63. And I need to roll back it to f.56.
Yesterday I contact with technician Fred, he told me to find help in this page :http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02693833&cc=us&destPage=document&jumpid=reg_r10...
And I follow the steps, and use sp66269.exe, copy the file into my USB.But when I insert USB and try to open computer with win + B ,then  the POWER button, the screen led just flash, screen was black. 
Then I entered Hardware Diagnostics, try to use roll back function, but it only told me "unable to open BIOS signature file"
or "the BIOS is not compatible for this machine". 
Then I found a page http://www8.hp.com/us/en/campaigns/hpsupportassistant/pc-diags.html?jumpid=va_r602_us/en/any/pps/pl_...
I downloaded the 2-in-1 USB key, but it doesn't work, maybe I made some mistakes. 
What should I do now?
Thanks.

Sorry, my machine is Envy 17 j184nr.

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