bigrat wrote:
這方法有辦法把bas...(恕刪)
baseband 升級的話....很難降回去的，要再多等等....
小弟通常 2G 那部都不敢大意升級，因為畢竟是水機，請節哀...先暫用備機，密切注意網路訊息吧。
個人積分：219分
文章編號：14644567
個人積分：6分
文章編號：14649315
個人積分：14分
文章編號：14661278
個人積分：151分
文章編號：14664211
個人積分：151分
文章編號：14664221
個人積分：454分
文章編號：14664896
個人積分：0分
文章編號：14665510
個人積分：197分
文章編號：14666235
個人積分：22分
文章編號：14667015
個人積分：0分
文章編號：14667231
The dev team has already advised users not to upgrade to iPhone OS 3.1 beta firmware. Both Geohot and Dev team have also advised users to save their iBEC and iBSS Signature Certificates of iPhone OS 3.0 for upcoming Jailbreak tools. Despite warnings, most of the users have updated their iPhone to OS 3.1 beta firmware (intentionally or accidentally) and now finding way to downgrade back to iPhone OS 3.0 firmware. It is important to note that, only iPhone firmware will be downgraded from 3.1 to 3.0 but not the baseband which ill remain 05.08.01.
Requirements:
ITunes 8.2 installed on your computer.
Original iPhone 3GS OS 3.0 Firmware.
Steps to Downgrade iPhone 3GS 3.1 to 3.0 OS Firmware
Step-01- Connect your iPhone to your computer using the USB cable.
Step-02- Switch off the device and put it in DFU. Follow simple instructions to put your iPhone in DFU mode- Click the ‘Home’ and ‘Power On’ button for 10 seconds and then release the power button only. iTunes 8.2 will display following window-
Step-03- Click on OK to continue.
Step-04- Click ALT (on keyboard) and ‘Restore’ (on iTunes) together and now select the original 3.0 firmware from your computer.
Step-05- Before doing the restore a confirmation message window will appear. Confirm by clicking ‘Restore’.
Step-06- A Restore Process will commence and at the end of restore process following error message “Unknown error occurred (1015)” from iTunes. Do not worry. You have not missed any step. Just click ok to continue.
Step-07- Download iRecovery for Mac and iRecovery for Windows to tackle the error.
Step-08- Extract the contents of the file “iRecovery-Mac.zip” on the desktop.
Step-09- Open application ‘Terminal’ (Applications> Utilities) and enter-
cd desktop
. / iRecovery-s
Step-10- Once you notice a Message entering in Recovery Mode, type following command
fsboot
Step-11- Once the iPhone 3GS is rebooted, you can notice the ‘Emergency calls only’. Now wait till the iTunes is uploaded and reactivates your iPhone 3GS automatically.
Step-12- You can now restore a backup or configure the phone as “new.” with the iPhone Firmware 3.0.
Once you have downgraded your iPhone 3GS from 3.1 firmware to 3.0 firmware you can use purplera1n. Purplera1n (beta) is a free tool to Jailbreak iPhone 3GS running 3.0 firmware on windows and Mac. Read our articles on how to use Purplera1n to Jailbreak iPhone 3GS (Mac) and Jailbreak iPhone 3GS using Purplera1n (Windows). Use Ultrasn0w to unlock iPhone 3GS.
