Are these legitimate steps to restore 4.0.1 BACK to 4.0.1 again? (iPhone 4)

[Ann P]

http://www.geekword.net/restore-ios-4.0.1/

I did a "Reset All Settings" in an attempt to fix proximity sensor problems. After doing so; 1) The set time for Password lock has 1 minute as the ONLY option 2) Visual Voicemail is not displaying at all. It just seems as if one problem leads to another. I am quite frustrated and have decided to just restore in iTunes as new. I just need to restore back to 4.0.1 for future Unlocking purposes. Can anyone confirm the steps in the link below? Will I able to re-jailbreak and unlock again? (Absolutely MUST avoid restoring to 4.0.2 or 4.1)

Thank you so much for any help.

 

[IrishVixen]

No. If you don't have SHSH blobs saved for 4.0.1, you cannot restore to it.

As of the date of that blog post, yes, you still could do what was outlined--Apple continued to sign 4.0.1 for several days after 4.0.2 was released, so for a time you could legitimately upgrade to the new firmware and back down without any workarounds. But it is no longer possible.

If you need the unlock but must update to 4.1, you have two options as of today.

http://thefirmwareumbrella.blogspot.com/ Upgrade to 4.1 while keeping the previous baseband (iPhone 4 ONLY), then JB with greenp0ison or limera1n and unlock with ultrasn0w.

http://blog.iphone-dev.org/ New PwnageTool release; Mac only. Upgrades and JB's via custom firmware, protects baseband from upgrades on iPhone 3G, 3GS, and 4. Then unlock with ultrasn0w as above.

 

[eastercat]

I thought you had to have a SHSH pre-4.1 to keep the baseband from upgrading. If having the 4.1 SHSH is sufficient, it would make it easier for those who didn't bother with SHSH before.

http://thefirmwareumbrella.blogspot.com/ Upgrade to 4.1 while keeping the previous baseband (iPhone 4 ONLY), then JB with greenp0ison or limera1n and unlock with ultrasn0w.