i accidently downgrade my iphone 4 from 5.0 to ios 4.3.4 for testing purpose. then when i want to get back ios 5.0, i got error 20 and my iphone stuck at recovery mode. i googles and failed to get the workaround how to resolve that.
after a day...i tried and tried many way...many times..after that i found the way...
error 20 fix
What I did was as follows:
1.downgraded my itunes to 10.2.2
2.downloaded 4.3.3 firmwire
3.shift+restore find the update and wait till its done
4.upgrade both itunes to itunes beta 10.5.0.48
5.download 5.0 firmwire
6.finally put the idevice in dfu mode and restore!
This worked for me and hopefully it'll work for you!
if u have any question, just emel to me @ irazzac@gmail.com
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