Iphone 3gs 4.1 downgrade ?

Hi is it possible to downgrade my iphone 3gs from 4.1 and then unlock it so i can use a three sim card in it ?
Answer #1
you can only do this if you saved shsh blobs on a previous version
Answer #2
which means what in english lol
Answer #3
you could use tinyumbrella
http://thefirmwareumbrella.blogspot.com/
and heres a tut
http://www.iphonefaq.org/archives/971063
of course its also need that you saved your ssh’s on sauriks server
Answer #4
a few months ago apple stopped letting people downgrade to 4.0.1/4.0.0/3.1.3 etc ..so when you try to hit shift+restore and load your ipsw file it will say “verifying with apple” then you will get a error code…try this method and you wont have to downgrade
http://www.coveringweb.com/2010/09/how-to-unlock-iphone-3gs-on-ios-41.html
Answer #5
Hi is it possible to downgrade my iphone 3gs from 4.1 and then unlock it so i can use a three sim card in it ?
Run TinyUmbrella and check what SHSHs blobs you have saved and then you can downgrade if you have SHSHs blobs saved.. But if you are on 4.1 and if you manage to downgrade FW you won’t be able to downgrade BB so that means you won’t be able to use this version of unlock ( you need to wait for new one )!