Urgent : What method to restore iPhone 3GS?

[sick190]

Need urgent help as I need to be out the house soon !

I have an iPhone 3GS (4.1) Jailbroken with redsn0w. It has cracks along USB port and dust under screen so I'm taking it into Apple shop tomorrow, therefore I need to restore it.

1) Restore it to 4.1 normally through iTunes (as long as I back up data)

2) Restore it to 4.1 using my SHSH Blobs through TinyUmberella.

3) Restore it to 4.2.1 using my SHSH Blobs through TinyUmberella.

Which method shall I do guys? Thanks !

[Tazz229]

I would save blobs do a normal restore through iTunes and providing you get the same handset back you can go back to custom 4.1.

[StealthBravo]

If its under warranty they might just swap it out