I have my iPhone 3GS jailbroken and yesterday there is an
update on Cydia called Mobile Substrate and I went ahead to update
it as I always do. After the update, it asked to reboot my phone
and after rebooting my phone its just stuck at the Apple Boot logo
and just hangs there. I tried plugging in my phone to the computer
but my iTunes doesn't detect my phone at all. What can I do? Any
help? I can't use boot up my phone at all now.
You must have installed an app that isn't meant for your current
iPhone OS version, for example installing an app that is meant for
OS3 in OS4.
Power off your iPhone, plug your iPhone into your computer with
iTunes. Hold down the [] Home button and then hold down the power
button to power on your iPhone. Wait until your iPhone boot pass
the Apple logo, and IF your iTunes detect your iPhone, upgrade the
firmware to the latest version and be a good boy and don't
jailbreak it if you don't even know how to check for the
apps version before you load it into your iPhone with the
wrong OS.
The iTunes will not fail to detect your iPhone, if it
does...then you have a hardware fault which I don't believe so.
If the iTunes is unable to upgrade your firmware to the latest
because your OS is corrupted, and the firmware fails while
upgrading halfway....then you either go look it up online on how to
do it or you bring it down to the Apple Service centre and
confessed to them what you did and hope they are willing to restore
it for you.
Most probably your iTunes will be able to detect your iPhone but
your firmware upgrading is likely to fail halfway.
Just be prepared lor....