howto downgrade from ios5.0.1 to ios4.3.3

system requirement:
~ run under windows (currently using winXP)
~ snowbreeze 2.7.3
~ ios4.3.3
~ itune v10.4.1.10

procedure for downgrading to old ios:
step #1: download itune v10.4.1.10 from website 'www.afterdawn.com'
step #2: install itune v10.4.1.10 into your system. pls take notes that i haven't try using latest
itune version yet for downgrading. if you do pls let me know is it successful or not.

note: if you have install latest version, here is how to uninstall itune properly
link: http://support.apple.com/kb/ht1923

step #3: goto 'C:\WINDOWS\system32\drivers\etc\hosts' and added with this line

74.208.105.171 gs.apple.com

then save it and exit.
step #4: download ios4.3.3 from website: 'ios 4.3.3'.
step #5: download sn0wbreeze 2.7.3 from website 'ih8sn0w.com/'.
step #6: followed the step shown as the following link: 'sn0wbreeze tutorial'. this tutorial will
guide through all the way to jailbreake your device.

note: when it requested for ipsw, pls select the ios 4.3.3 that you have downloaded.
step #7: after you have finish downgrading, remove the '74.208.105.171 gs.apple.com' from the
hosts file.
step #8: FINISH.

any question feel free to give comments. thanks.