How can i install windows 7 on macbook pro lion  from usb?

hello am sorry to disturb you
i would like to know the above question since i have looked almost everywhere and i have received no answer
i have a macbook pro i5 with lion
i have been trying for month to install windows 7 as a secondary boot to my mac
but i haven't been able to
things that i have done
-i had downloaded win7 iso
-using another computer i installed win7 on the usb { win to flash }
-i have used bootcamp assistant but apparently i need a dvd of win7 which i currently don't have
-i have installed Reffit but i always get a flashing screen when try to load windows
please i hope you can reply me back if possible
my thoughts are
is that apple disabled the efi on lion to not be able to boot from usb flash drive
my reasoning to this is that is used to work  on leopard but not lion
again am trying to boot from usb not burn a disc
please help att alcidio

Rule #1 that TP missed: ISO have to be burned at SLOWEST 2X burn speed to work.
There is/was a long thread but booting Windows from USB-DVD or flash is hit or miss, it may work. USB-DVDs often do not but it is possible to edit the plist to add the Mac ID string to it.
Boot Camp Assistant -
create a partition (done)
download Windows Support Software (drivers to install after Windows is running) (done)
Start the install and boot process - not really needed or essential
And you can use Paragon, you can use Windows 7 or later DVD and do entire install (but on a dedicated 100% Windows hard drive).
Flash drive: has to be MBR and FAT or NTFS (I think, sounds right) same for putting Apple drivers on flash card  for which there is an Apple Tech Article.

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