SB5101 Factory Mode with bit file method

[jawlinski]

Haynes Cable Modem Guide Rev1.7.2.pdf says
"The bit file method works on firmware 0.4.5.0 and up on SB3100, SB4100, SB4101
And, SB4200.
And on any SB5100, SB5101 and SBG900."

Could anybody enable factory mode on 5101 with bit file method?
How did you calculate the integer value of your HFC MAC address.

thanks
p.j.