Help!!

[earlzie]

hey guys... so i have an iphone 3gs 4.1 and i was on 4.2.1 but i was stuck in recovery mode so i downgraded to 4.1 now my phone is stuck at the recovery screen saying insert valid sim and pin with no lock...
is there a way to jailbreak and unlock it without having to bring it to bell and getting them to start it up again... i had it unlocked in 4.1 and wanted to upgrade to 4.2 n lets just say that didn't go well.. i tried using tiny umbrella to kick me out and it just goes back to that screen asking for sim and pin.
any help would be greatly appreciated!

[Simon]

You can use limera1n, greenpoison or redsnow 0.9.6b6 to get past that screen