1) The first problem in your downgrade is that you probably are getting error 20 in restore mode and error 160x in DFU mode. This is due to iTunes 7.7. So, you now you need to uninstall iTunes 7.7 and install iTunes 7.5. Make sure after your iTunes 7.7 uninstall you reboot your pc as it requests you to. **OSX users, see note at bottom of page to downgrade your iTunes.
2) Now that you have iTunes 7.5, you will still have the DFU driver for 7.7. This is good and will allow the process to work. Put your phone into DFU mode using the DFU steps.
3) Restore using iTunes 7.5. You will get an error like 1011, 1013, 1015. This is normal and expected. An error 1601, 1602, 1600 or anything else is not ok.
4) Once you get error above, leave iTunes open and kick your phone out of restore mode. I recommend just loading winpwn(PC) or pwnage(MAC) and pwning the device at this point. If pwnage fails to work, you need to restore your phone again. You should be able to use normal restore mode, however. Other ways to kick out of restore mode may be ibrickr, jailbreak 1.1.2 (boot phone), iLiberty+.
5) Once completed, you have a pwned device with baseband 4.05.04_G from firmware v2.0.
6) To get back to 04.04.05_G (1.1.4 baseband) load bootneuter. If you don’t have this, install it from installer. Run bootneuter with Neuter, 4.6, and unlock. When it’s done, you will have an unlocked 04.04.05_G right back where you started.
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July 23rd, 2008 at 10:55 am
1) The first problem in your downgrade is that you probably are getting error 20 in restore mode and error 160x in DFU mode. This is due to iTunes 7.7. So, you now you need to uninstall iTunes 7.7 and install iTunes 7.5. Make sure after your iTunes 7.7 uninstall you reboot your pc as it requests you to. **OSX users, see note at bottom of page to downgrade your iTunes.
2) Now that you have iTunes 7.5, you will still have the DFU driver for 7.7. This is good and will allow the process to work. Put your phone into DFU mode using the DFU steps.
3) Restore using iTunes 7.5. You will get an error like 1011, 1013, 1015. This is normal and expected. An error 1601, 1602, 1600 or anything else is not ok.
4) Once you get error above, leave iTunes open and kick your phone out of restore mode. I recommend just loading winpwn(PC) or pwnage(MAC) and pwning the device at this point. If pwnage fails to work, you need to restore your phone again. You should be able to use normal restore mode, however. Other ways to kick out of restore mode may be ibrickr, jailbreak 1.1.2 (boot phone), iLiberty+.
5) Once completed, you have a pwned device with baseband 4.05.04_G from firmware v2.0.
6) To get back to 04.04.05_G (1.1.4 baseband) load bootneuter. If you don’t have this, install it from installer. Run bootneuter with Neuter, 4.6, and unlock. When it’s done, you will have an unlocked 04.04.05_G right back where you started.
July 22nd, 2008 at 8:41 pm
我進入不了DFU 一開機就出了一個usb插頭+itunes圖示哪 上網看過 他們說這是個回復mode 而不是DFU 但我想進人DFU時又卡在哪 開機 按 住中間的按鈕然後再按開機 但進不了DFU 因為DFU是全黑的 高手幫幫我啊
iphone reply on July 22nd, 2008:
回復時有出錯誤??
July 21st, 2008 at 7:53 pm
救求呀 今天不小心update了 2.0 結果變白蘋果 而且修復時還出了未知錯誤 請高人指點
iphone reply on July 22nd, 2008:
@_@”
那降回 1.1.4??
試試入DFU mode restore