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Old 21st October 2008, 11:42   #816 (permalink)
srijit
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Join Date: Jan 2008
Location: Trivandrum
Posts: 596
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Well how did you install ver 2.1 in the first place?
Use the same procedure in iTunes to install 2.1 again, hence re-install

You can find guides at iClarified.com like
iClarified - iPhone - How to Unlock/Jailbreak Your 2.0 2G iPhone (Windows) [Updated]
and
iClarified - iPhone - How to Unlock/Jailbreak Your 2.x.x 2G iPhone (Mac) [Updated]

They also have downgrading guides.
iClarified - iPhone - How to Downgrade Your 2.0 iPhone to 1.1.4
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