Do the normal update in iTunes or get it using one of these links:
iPad
http://appldnld.apple.com/iPhone4/041-0329.20110311.Cvfre/iPad1,1_4.3_8F190_Restore.ipsw
Size: 625814678
MD5: 9a889ba48bc2715292f199f50c70ed60
iPhone 3GS
http://appldnld.apple.com/iPhone4/041-0328.20110311.Lkhy6/iPhone2,1_4.3_8F190_Restore.ipsw
Size: 443762287
MD5: 87ebb9b2c025fb5f87a4cab0631b1547
iPhone 4
http://appldnld.apple.com/iPhone4/041-0330.20110311.Cswe3/iPhone3,1_4.3_8F190_Restore.ipsw
Size: 702264955
MD5: e0a463bded8f5b1e076b466535b18c75
Source: http://www.felixbruns.de/iPod/firmware/
(iPhone4 is mentioned in the URL but the f/w filenames reflect iPad, where applicable, so I only assuming they are correct)
Note: the info above is from my own downloads so may not be 100% accurate, I think it is all correct though. Please post a reply if you suspect something is incorrect.
There is no iOS 4.3 for the iPhone 3G, so seems 4.2.1 is the last for that generation device, which was kinda known
iPad
http://appldnld.apple.com/iPhone4/041-0329.20110311.Cvfre/iPad1,1_4.3_8F190_Restore.ipsw
Size: 625814678
MD5: 9a889ba48bc2715292f199f50c70ed60
iPhone 3GS
http://appldnld.apple.com/iPhone4/041-0328.20110311.Lkhy6/iPhone2,1_4.3_8F190_Restore.ipsw
Size: 443762287
MD5: 87ebb9b2c025fb5f87a4cab0631b1547
iPhone 4
http://appldnld.apple.com/iPhone4/041-0330.20110311.Cswe3/iPhone3,1_4.3_8F190_Restore.ipsw
Size: 702264955
MD5: e0a463bded8f5b1e076b466535b18c75
Source: http://www.felixbruns.de/iPod/firmware/
(iPhone4 is mentioned in the URL but the f/w filenames reflect iPad, where applicable, so I only assuming they are correct)
Note: the info above is from my own downloads so may not be 100% accurate, I think it is all correct though. Please post a reply if you suspect something is incorrect.
There is no iOS 4.3 for the iPhone 3G, so seems 4.2.1 is the last for that generation device, which was kinda known
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