If you have been experiencing the iTunes Error 37 problem on your iPhone 3GS there is now a fix available for the issue that seems to occur when a user is midway through restoring to the custom Sn0wbreeze firmware using iTunes.
Well according to an article over on Redmond Pie by Taimur Asad, Sn0wbreeze has now been updated to v2.0.1 and delivers a fix for the iTunes Error 37 on iOS 4.1 Jailbreak.
So to stop receiving the error 37 message you’ll need to download Sn0wbreeze version 2.0.1 from (here) and then follow the tutorial which can be located by hitting up (here)
Once done Sn0wbreeze 2.0.1 should sort out the iTunes Error 37, but of course if you do happen to have any problems with it feel free to let us know by dropping us a comment.