Downgrade iPhone 3G, 3GS, 4 firmware 4.2.1 to 4.1

Home Downgrade Downgrade iPhone 3G, 3GS, 4 firmware 4.2.1 to 4.1

Downgrade iPhone 3G, 3GS, 4 firmware 4.2.1 to 4.1

Why do you want to downgrade your iPhone firmware, that there must be some reason. Step by step to downgrade the iPhone firmware is not difficult. Please continue reading below, as I have previously written.

1. Connect the iPhone to the computer.
2. Open iTunes.

Image 1.1.1

3. Synch your iPhone with iTunes.
4. Download iPhone firmware:

iPhone 3G (4.1/8B117) click here
iPhone 3GS (4.1/8B117) click here
iPhone 4 (4.1/8B117) click here

5. Download “TinyUmbrella (4.1.6)”

For Windows click here
For Mac click here

6. Make your iPhone into “DFU mode”
7. Warning message appears in iTunes, click OK.

Image 1.1.2

8. Press Shift + Restore (Windows) or alt + Restore (Mac).
9. Find iPhone firmware *ipsw file, click “Open”.

Image 1.1.3

10. If a message window pops up in iTunes, select “Restore”.
11. Wait until the installation complete.
12. After the message “error occurred (1015)” on iTunes, click OK, then click OK again.

Image 1.1.4

Image 1.1.5

13. Now open “TinyUmbrella (4.1.6)”. In Windows users, right click “Run as administrator” - “Allow access”.
14. After that click “Kick Device Out of Recovery”, then “Start TSS Server”. iTunes will automatically shut down, let it go, just keep your iPhone.
15. A few minutes later, the iPhone will come out of recovery mode, and can be active again.
16. Click “Stop TSS Server” on TinyUmbrella, then”Exit”, (Click on “Save My SHSH” if you feel you need it).
17. See the screen on your iPhone, more or less like this after a successful downgrade and activated.

Image 1.1.6

Image 1.1.7

18. Disconnect the USB cable to your iPhone from the computer, then connect it again.
19. Back to iTunes, now you can choose whether you want to “Set up as a new iPhone” or “Restore from the backup of:…”, then click “Continue”. And finally, ...