I have tested on my own 3GS newbootrom and I am on stock here on iOS 5.1 till 14th March 2012.
According to critical warning currently posted by BigBoss.
Apple released 5.1 iOS and closed all previous iOS to downgrade. If you are jailbreaker please keep it in your mind, once you updated to iOS 5.1 then you will be stock on it. you can't downgrade to previous firmware, if you have not save your previous version's shsh blobs. If you have saved your shsh blobs then you may downgrade otherwise no way. Another problem is if you have updated to 5.1 iOS then you only may do tethered jailbreak even though your cydia won't work for all newbootrom and earlier iDevices. If you don't know how to save shsh blobs, please don't update or don't do factory restore by iTunes. Guys, if you have any questions please leave on comments.
Note: 3G/3GS can restore to iOS 4.1 still signing by Apple server.
According to critical warning currently posted by BigBoss.
Apple released 5.1 iOS and closed all previous iOS to downgrade. If you are jailbreaker please keep it in your mind, once you updated to iOS 5.1 then you will be stock on it. you can't downgrade to previous firmware, if you have not save your previous version's shsh blobs. If you have saved your shsh blobs then you may downgrade otherwise no way. Another problem is if you have updated to 5.1 iOS then you only may do tethered jailbreak even though your cydia won't work for all newbootrom and earlier iDevices. If you don't know how to save shsh blobs, please don't update or don't do factory restore by iTunes. Guys, if you have any questions please leave on comments.
Note: 3G/3GS can restore to iOS 4.1 still signing by Apple server.
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