(adsbygoogle = window.adsbygoogle || []).push({}); im trying to update and iphone 3gs i think its a 3gs because its model is a1303.

my friend wants it unlocking, currently its on firmware 4.0.2 and im try to get it to 4.3.3,

i have the 4.3.3 on my desktop i shift restore and i always get the error 3419, ive even downloaded a new host file and ive also used tinyumbrella i cant get past the error