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Hi all, my IP4 is on 4.0.2 i need ultrasn0w for the unlock. I have been tempted to upgrade to 4.2.1, but instead can i just upgrade to 4.1 using a custom ispw.

asked 11 Feb '11, 22:10

AndyHayes's gravatar image


To downgrade* to 4.1, you need SHSH backups.

How do I downgrade the firmware?

*installing any firmware older than currently newest (4.2.1) is considered a downgrade


answered 12 Feb '11, 10:38

http's gravatar image

http ♦

To install 4.1 you would need 4.1 hashes. If you have those update to 4.1 using TinyUmbrella to save your 1.59.xx baseband. Ultrasn0w will unlock that baseband. Check iClarified for a tutorial


answered 12 Feb '11, 11:03

dhlizard's gravatar image


edited 12 Feb '11, 11:04

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Asked: 11 Feb '11, 22:10

Seen: 417 times

Last updated: 12 Feb '11, 11:04

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