What does Apple upgrade downgrade mean? Is it harmful?

Apple has officially announced the official shutdown of October 17 and iOS 3 and iOS 110 System verification channel, iPhone, iPad, or iPod that has been updated to the latest iOS system will not be able to go back to the old version.

Apple upgrade downgrade means upgrading or restoring the iOS system to the previous version.

Apple upgraded its software to get a better user experience. However, upgrading to the latest system will be more stuck, so you need to downgrade.

Downgrading is only supported for devices with A4 chip and below, i.e. iPhone 4. If you want to upgrade, it is recommended to connect your phone to the computer to upgrade. The dodge is to remember to back up your data.

The other is that when upgrading, don't touch the data cable. Keep your battery charged.

The so-called downgrade refers to the version of the system. It's like installing a computer system. There is no such thing as harmful.

It should be noted that before the iPhone is upgraded, you must do SHH backup to bring it back, otherwise the operation is irreversible.

Upgrading and downgrading means reinstalling the operating system. For example, your computer is now Windows 7, and if you install 8, it is an upgrade, and installing XP is a downgrade....No damage to the phone. However, if your phone is locked, you should pay attention to whether it can be upgraded.

Apple System Upgrade Apple will update the system from time to time to fix system vulnerabilities Upgrades are easy Downgrade is more difficult.

Harmful or not, this depends on how you look at it.

Personally, I think that buying a mobile phone is just for use, not for buying, just tossing is fun.

Upgrading is harmless, but if you're jailbreaking, consider upgrading.

The downgrade of the Apple phone has an impact on the phone. First of all, after downgrading, you will not be able to enjoy the new version of the iOS system related software, except for the new version of the iOS system to reduce the speed of some models, most of them are the optimization and humanization of the old version.

Secondly, it is difficult to guarantee the security of the system. Most of the reason why Apple develops the new version is to make up for the remaining vulnerabilities or backdoors left over from the previous version, and if you choose to downgrade, these vulnerabilities may be exploited by criminals, making it difficult to ensure the security of your phone.

Many people downgrade in order to jailbreak, because the new version of the system jailbreak belt is too high, the old version of the system jailbreak technology is more mature, some people choose to downgrade because of this, then this may cause you to not be able to enjoy Apple's three guarantees of service, if your phone is damaged, you have to pay out of pocket to repair.

This time, the downgrade channel was closed after only a few hours, so why did this happen? Because iOS devices are forced to keep the latest system version is to prevent the leakage of user information caused by vulnerabilities in the lower version, and also to prevent someone from stealing the mobile phone and reusing the mobile phone through the downgrade method, which reduces the theft rate in disguise.

You can use the iTunes software to reflash the backed up system to your phone on the computer that has backed up the old system to achieve the downgrade function.

Because the activation of the iOS system requires Apple's background verification, Apple's regulations are to upgrade the new version in about a few days to 1 week or at the latest 2 weeks will close the verification channel of the old system, so it becomes impossible to downgrade after this time, and the current trend is that as long as the new version is released, the old channel will be closed and downgraded within a few days after the update, and the upgrade of the iOS system will be treated carefully.

Once the iOS device is upgraded to the iOS system, it cannot be downgraded, because: 1. iOS adopts the recommended upgrade and mandatory upgrade strategy to keep the latest upgrade, and once upgraded, it is impossible to downgrade. 2. It is mandatory to maintain the latest system version to prevent information leakage to users caused by vulnerabilities in the lower version.

3. Apple has launched the ID lock since iOS7, and the prohibition of downgrade is to prevent someone from stealing the mobile phone and reusing the mobile phone through the downgrade method, so as to reduce the iPhone theft rate.

Apple is forced to upgrade the system, can not downgrade, hopefully.

It is risky for Apple mobile phones to upgrade and downgrade frequently, and it is not recommended to do this often, and since the ios7 system came out, Apple mobile phones cannot be downgraded.

Since the ios7 system came out,It can't be lowered,iOS7It's definitely not as smooth to use as the previous system,If you upgrade to more than 7 now, you can't drop it back,Apple has turned off the verification。

Apple's official explanation is that the device downgrade is not allowed for security reasons. After Apple launches the new version of the system, it will close the system verification of the old version, and the system that has been shut down will be noisy and suspect the version, which means that there is no way to flash the version that should be closed to verify the hidden proof. Only the latest version can be used.

So if the phone is working properly, there is no need to upgrade. Upgrades are usually new features for ** phones, and it doesn't make much sense to upgrade older phones and may slow down your phone.

Some old systems, (ios7 or below) can be jailbroken and flashed with Aisi assistant to achieve the purpose of downgrading, but the operation is more complicated, and jailbreaking is risky, so it is not recommended to do so.

1 It may be that the hardware is broken.

2. Change the downgrade method and try it by flashing the system, you can use Aisi or iTunes

Useful Thank you.

Apple can also restore the previous system after upgrading the system.

In order to achieve system degradation and recovery of the Apple mobile phone system, it must be realized within the specified time, which can be used as a verification period; As long as it is within this time period, you can downgrade back to the previous version even if the device is upgraded. Once this port is down, it is not possible to revert to a lower version of the system.

Precautions for iPhone use:

1. It is best to prepare a bag when you usually use it, and put your mobile phone in it when you go out, so as to avoid the wind and sun exposure of the mobile phone in your hand, which will darken the color of the Apple mobile phone for a long time.

2. Use the Apple mobile phone to wipe it frequently, many friends do not care about this when using the Apple mobile phone, and do not wipe it after using the morning beat every day, the machine will have an old feeling after a long time, it is recommended that you wipe it with facial paper once a day, so as to protect the machine to the greatest extent.

3. Apple mobile phones are also very good for playing games, but when we use Apple mobile phones, remember not to use them for more than four hours in a row, especially to play games and watch, which will accelerate the aging of electronic components.

4. Apple's mobile phone is a relatively durable machine, and everyone's reputation is also very good, but some friends' machines are very troublesome to use, and often the machine responds slowly, in fact, this is because you ** some domestic software and Apple's mobile phone are incompatible, it is recommended that you uninstall it as well.

5. In fact, the charging of Apple mobile phones needs to be paid attention to, and it is recommended that you charge the mobile phone in time when the power is less than 30%, which can prolong the life of the mobile phone. <>

Teach you how to downgrade Apple system.