UPDATE: Save yourself from all these troubles by making your i Phone officially unlocked (that means no jailbreaking or worrying about software updates, ever! If you’re happy with i OS 4.1 and would like to unlock it, read on… ) This will be a lengthy process so if you have an AT&T i Phone 3GS, you can save all the troubles and unlock it permanently using this.
Also see - Jailbreak i OS 8.1.2 for Cydia using Tai G tutorial [Windows users].
Here are the steps just go through them carefully and if done properly your carrier network will be clearly flashing on your home screen.
And this time hopefully it should show the signals because everything is properly set.
i Phone and i Pad users had reported lot of issues with i OS 8.3 update, including purchased ringtones won’t play, i OS 8 Wi Fi problem, no message notification sound, unable send or receive messages etc.
They also face i Cloud music library can’t be enabled error.
SEE ALSO : How to Downgrade i OS 8.4 to i OS 8.3 on i Phone, i Pad So if you hit any issue based on Apple new i OS 8.4 update, do let us via comment.However, it’s still possible to unlock your i Phone by updating the baseband to 6.15.00 and then downgrading to 5.13.04. Now download redsn0w 0.9.14b2 that can downgrade i Pad baseband to 5.13.04 for Windows or Mac. Use this tutorial here (it’s for baseband 6.15.00 but will work for any baseband). Download latest version of Tiny Umbrella from here. Remove i Tunes and install i Tunes 10.4.1 for Windows (32-bit) or Mac. To make sure you can always go back to i OS 4.1, launch Cydia and select ‘Make my life easier.’ Part 3: Downgrading to baseband 5.13.04 (GPS Fix) 14. Go to Extras Select IPSW button in redsn0w to point to the original firmware you downloaded in Step 2. Do a controlled shutdown of your i Phone (“slide to power off”). DO NOT INTERRUPT your i Phone while baseband flashing is in progress. When done, your i Phone will reboot itself and you will now have i OS 4.1 with baseband 5.13.04 that can be unlocked with ultrasn0w. You may want to update to i OS 5.1.1 which has untethered jailbreak and can also be unlocked with ultrasn0w 1.2.7. If you cannot find it, add new sources by typing ultrasn0w repo: 23. Once again, if you have an AT&T i Phone 3GS, unlock it using this. Follow on screen instructions to put your device into DFU mode to begin the jailbreak. When the process is done, you will find that your i Phone is now jailbroken on i OS 4.1 with i Pad baseband 6.15.00. Check the ‘Downgrade from i Pad baseband’ checkbox, uncheck Cydia and click Next. Redsn0w will start doing the downgrade and you will see ‘Flashing Baseband’ screen on your i Phone with the Pawnapple icon. Some users are experiencing trouble installing the i OS 10 software update by way of the Over-the-Air Software Update mechanism.