iphone4 4 1 upgrade to 5 0 1 can you upgrade with iTunes by yourself !

Yes, the information will be gone. But as long as you use iTunes to sync once before upgrading the software, it will automatically back up all the data, after the upgrade will be prompted to ask you whether to restore the data, confirm that it is OK, and then all the data is back, in addition to the things installed through the jailbreak, if you want to make a full backup, you can use the full backup function of 91, you can back up everything, and restore all the complete after the jailbreak, but a lot of software can not be used in it.

Yes, but it will take a long time, and the process is cumbersome, so it is recommended not to upgrade. After upgrading, the machine won't be fast.,The interface won't be much more beautiful.,It's just that some details have been modified.,The more obvious changes are to improve the information prompt and iCloud.,But it's not very useful.,There's no need to upgrade.。

iTunes will automatically back up your data when you upgrade, and it will automatically reply after the upgrade is successful, so you don't have to worry about it.

The most important problem to pay attention to is that if you have a locked phone, it may be locked, but the Hong Kong version is unlocked.

99% of the software can be used after upgrading, and even if it is not available online, there is definitely an upgraded version for use.

Yes, but this requires a backup (applications, data, **, movies, **...) If you think iTunes is troublesome, you can go to Weifeng to find and ** patch, use iTunes to install it directly, as for backup, you can use iTunes backup, you can also use the synchronization assistant (online and offline) backup.

It is advisable not to do this. Especially jailbreak machines. Unless the preparations are done.

A search on the Internet shows that there are countless lessons of blood and tears due to lack of promotion.

The steps are as follows;

Connect iTunes, turn off your iPhone, press and hold the Home button and the Power Off button at the same time for 10 seconds, release the Power Off button, continue to press and hold the Home button until you see the device recognized in DFU state on the computer, after the computer prompts, release the Home button, select the recovery option button on iTunes, and click Confirm Recovery in the pop-up selection box.

3.Next, iTunes will pop up a page prompting that everything will be erased, and it will also verify the recovery with Apple servers, when the verification and extraction of files are completed, iTunes will automatically reinstall the **good firmware version for the iPhone, wait for the installation to be successful, and then reinsert the mobile phone card to activate the iPhone online.

iPhone 4 is recommended not to update, many people say that iPhone 4 running iOS 7 is very stuck.

It's better not to update, iPhone4 can't keep up with the ios7 version in hardware, it will make your machine very stuck, I use 4S dual-core upgrade to feel stuck, it's really terrible when playing games. Many people who have upgraded regretted that they can't downgrade, so I advise you not to upgrade.

1. It is guaranteed to be the latest iTunes version, and iTunes does not need to be connected to the mobile phone when upgrading. The upgrade is only to update the software files, and the data in the folder is not related, so there will be no loss.

2. The upgrade needs to be completed by connecting the mobile phone to iTunes, and the mobile phone data can be backed up before the upgrade, and the backup can be restored after the upgrade.

3. If you don't jailbreak, you can upgrade directly, but pay attention to whether your phone is locked or unlocked, it will be tragic to upgrade with a locked phone, and it doesn't matter if you have a locked machine.

4、There is no need to back up the firmware,For people who play the machine, they have the previous versions of the firmware stored in the computer,For the convenience of downgrading,Maybe you want to express this meaning,Backup also refers to shsh information,This information exists on the Apple server,Used to verify the firmware update,That is to say, you don't have the previous shsh information,You can't downgrade the previous version,You can only upgrade the version,Like the first floor brother said,Now the firmware has been released, The shsh before the backup was almost turned off, and now it's too late. (shsh is used to control your firmware upgrade information, without shsh backup, you can only upgrade but not downgrade, and Apple officially controls it in this way, only let you upgrade and not let you down.) If you have backed up previous versions of shsh, then there is software that can locally emulate the shsh verification environment of Apple servers, so that you can freely upscale and downgrade your firmware).

5. If there is a locked machine, you need to pay attention not to upgrade, the upgrade will lock your ** function, and the unlocked machine will be upgraded directly.

1: iTunes upgrade will not affect any of your data 2: iphone4 upgrade to of course to connect the phone to ah otherwise who to upgrade oh 3:

There is nothing to pay attention to if you don't jailbreak the firmware, jailbreak people should pay attention to whether to upgrade4: backup firmware is to say that people who have jailbroken For example, the version can be perfectly jailbroken at this stage, and then the cracked software can be used, but when you upgrade, the cracked software is useless At this time, you want to restore it to is not possible Because the official server is already the version, so you need to back up so as not to accidentally upgrade and recover.

5: It's just been released now, and the bugs and some other factors haven't been fully mastered, but don't worry, what Apple has come up with must be a good thing, and it's okay to go up.