Iphone 4G peculiar help

[sogaro]

I have an Iphone 4G with 4.1 running on it. I presently use Gevey sim to use it and would wan to upgrade to higher firmware such as 4.3.3 (don't ask me why) I checked my phone and saw UltraSnow on it and just upgraded that to the latest of 1.2.3 . What next do i need to do to make this JB successful.Do i use UltraSnow to jb after upgrading or use Snowbreeze?

[sogaro]

I managed to do it using Snowbreeze and its now at the activation page, it complains of invalid sim, what do i do to get past this Activation page?

[sogaro]

My Iphone is online, after much tweaking i sorted it out.