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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

AndyHayes
16517


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

link

answered 12 Feb '11, 10:38

http's gravatar image

http ♦
5.3k423451

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

link

answered 12 Feb '11, 11:03

dhlizard's gravatar image

dhlizard
2.1k5412

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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