O posibila metoda de a face downgrade de la iOS 4.0.2 la iOS 4.0.1 pentru iPhone 3GS


Astazi a aparut pe blogul lui BigBoss(cel care are si repo-ul din Cydia) un tutorial care spune ca le permite celor cu iPhone 3GS si iOS 4.0.2 fara SHSH salvat sa faca downgrade la iOS 4.0.1 fara Cydia fara SHSH fara nimic. Am incercat acel tutorial pe telefonul meu si am primit doar eroarea 3194, deci restore-ul nu a mers pentru ca Apple nu semneaza acum fisiere SHSH pentru 4.0.1 si fara SHSH e practic imposibil sa faceti downgrade. Unii spun ca tutorialul le-a mers, insa mai multi spun ca nu au reusit sa faca downgrade, nici eu nu am reusit asa ca deocamdata spun ca acest tutorial este fals si un functioneaza.

Daca vreti totusi sa urmatii pasii, ii aveti mai jos in engleza iar mai spre seara ii voi reface in romana :

1. Download 4.0.1 ipsw

2. Extract it with winrar or winzip  to a folder on the desktop. You may need to rename the firmware file from .ipsw to .zip to do this.

3. Open the buildmanifest.plist with the notepad. Search and replace all – 8A306 with 8A400.  Save. Repeat the same with the file restore.plist

4. Download 4.0.2 ipsw and open this with winrar or winzip. Note: do not exact it. Just open it and leave it open. You must use this exact file and not create a new one. If you have to create a new one for reasons like you are on OSX, then use zip command line not explorer or finder to make the zip. I will assume you are using the original file opened in winrar for the rest of this guide.

5. Take all the files from the 4.0.1 and drag them over to the 4.0.2 zip archive that you have open.

6. Delete all the dmg files that have 002 at the end, leaving only the 001 files left.

7. Save the archive. And rename it back to .ipsw if you changed the name to get winrar/winzip to open it.

8. Optional: (this helps ensure you get an shsh file request for the future, but should not be necessary to just restore 4.0.1).  Add the gs.apple.com line to the host file.

9. Put the device into dfu, open iTunes and restore the firmware you changed.

Check out the original post or give thanks to CodeBlue at his blog.