An article to popularize all kinds of basic knowledge of iOS

This article by Purplesword (jzj1993) original, reprint please specify. Original URL http://blog.csdn.net/jzj1993

Keywords: brush activation SHSH downgrade jailbreak Cydia Apple store itunes store itunes buy licensed parallel port version of the Japanese version of the refurbished machine imei/serial number/string three yards in one has a lock card affixed with the built-in card stick baseband

Note: The picture is from the network, this article only discusses the knowledge of iOS from the technical and knowledge level, which involves the non-proper behavior such as cracking, please obey the relevant laws and regulations consciously.

Found that there is a lack of more than the overall basic knowledge of iOS popular posts, so here I know the relevant knowledge of the popularization of it. Basic knowledge is widely available here and does not involve specific operations. There is not a whole content welcome to add, there are mistakes in understanding also welcome criticism.

Brush: The price is the process of re-writing the iphone to the operating system, equivalent to the computer's reload system. When the machine is being brushed, information such as apps and contacts in the phone will be lost (unless synced online). The brush machine can be implemented with the itunes software on your computer, usually using the itunes brush, only the latest version of the system supported by the device. In addition, if the new version of the iOS system launched, on the phone can also be downloaded directly to update. Usually brush the machine only from the lower version to the same version or higher version of the brush, if you want to downgrade, you need certain conditions, see below.

Activation: The new iphone (other iOS devices are similar, the following is no longer emphasized) need to activate the Internet, when activated, the iphone device information is sent to the Apple Activation server, obtain a certificate file, to activate the phone, to normal use. Each time iOS releases a new version, the previous version of the activation service is turned off, and then the system cannot be activated. So if you downgrade the brush from a high version, it is not possible to follow the usual method. How to achieve it? Please refer to SHSH.

Shsh:shsh is a certificate file that is obtained from the Apple activation server when the phone is activated, and this file is unique to each device for different versions of the system. Sometimes we may need to re-brush the system back to an earlier version, when there is a case of non-activation, because there is no certificate file. And if this version of the machine before the upgrade, we have a backup of the Shsh file, and then restore back, so that the phone can be activated. It is also worth noting that it is not necessary to back up the SHSH can be degraded, and depending on the situation, the need to use the features of the tool, as well as the characteristics of the device in a specific version of the range can be degraded brush machine.

Jailbreak: The iOS system is based on UNIX systems. For a mobile phone operation, there are a number of restrictions on the applications running on the system, usually to ensure security stability. and jailbreak is to crack these restrictions. Become a jailbreak on an apple system, and in Android we call it root access. What good is a jailbreak? In fact, the biggest two benefits, one can not spend money to install a lot of toll application (legendary piracy), second, can install a variety of convenient and practical plug-ins and software. For example, iOS comes with a relatively single input method, but not jailbroken mobile phone is not able to install third-party input method, but jailbreak can be installed on our familiar Sogou input method.

Cydia:cydia is a jailbreak user must install a software, through Cydia, we can download a variety of plugins, as well as Sogou input method such applications. For general applications, the extension is IPA, and Cydia is generally the Deb format, because the Apple system is based on the Unix,unix installer package is the Deb format. Plugins and applications that are downloaded via Cydia often require relatively high permissions that are not available in non-jailbroken systems that are packaged in an ordinary IPA format.

Apple store/itunes store/itunes: For a normal, no jailbreak iphone, there are two main ways to install apps, one is through the phone's own applestore, and the other is to connect the computer to the official ITunes software installation. itunes is a computer-side software that, when connected to a phone, uses itunes to synchronize data such as music-photo videos. The ITunes store is used primarily for the purchase of genuine music movies.

In-app: There are two main ways to charge for iOS apps, one is to pay for it when you download it, and the other is to buy in-store. For example: Unlock some levels in the game, apply upgrade to Pro, or upgrade from free AD to ad free, some ebook reader in book Purchase, etc. Some in-app purchases can also be cracked through jailbreak installation plugins, such as Locallapstore.

Licensed/Parallel imports/Hong Kong/Japanese/American: When the iphone is launched, it will be sold in different places, sold in mainland China, known as the licensed, others are called parallel imports. Parallel imports of quality and licensed compared to the fact that there is no difference. The difference is that different versions of the network service provider support is not the same, that is, the U.S. version often does not support China Mobile, Unicom, China Telecom, and the other versions of after-sales service only for the corresponding regions, the U.S. version of the mobile phone in the mainland can not enjoy the warranty and other after-sales service. But the United States and other often the price is much lower than the licensed.

Refurbished machine/imei/serial number/sequence number/three yards in one: the so-called refurbished machine, is the second-hand mobile phone low-cost recovery, and then carry out some necessary repair, replace a new shell, as a brand-new mobile phone high-priced sell. If it is a licensed mobile phone, the identification of whether the machine is a common judgment mark is three yards in unity. Each phone will have a unique IMEI number, also called serial number, composed of 15 digits, the phone dial input * #06 # can be seen (not just the iphone, other phones are the same), or in the "Settings-general-about the native-imei" can be seen; the phone box will have a label, It has this number, and the phone's body (the iphone is usually on a SIM card tray) also has this number. The three numbers of the new licensed handsets should be consistent. Of course, only by this point can not be completely determined that the phone is not a refurbished machine, do not rule out a business can also modify the internal IMEI number of the phone, and the fuselage, box on the number of forgery is easier. If not licensed mobile phones, usually not good judgment, such as the U.S. version of mobile phones, usually stock are some abnormal channels, mobile phones are usually activated, and there will be a unpacking, mobile phone alone shipping process, packaging will be mixed, even if the genuine is not necessarily three yards in one, so there is no good way to judge. The IMEI number is sometimes referred to as the serial number, but for the iphone, the serial number refers to another 12-digit alphanumeric number, which is also unique and can be seen in "settings-generic-about this machine-serial number". Through the online search iphone serial number or IMEI number, you can know the date of production of mobile phones, sales, warranty period and other information, specific ways can be self-searching online.

　　

There is lock/no lock: The so-called lock, which is said earlier, such as the United States version often can not support the domestic network service providers, so that mobile phones can only be used as a general purpose, can not call, texting, cellular network (GPRS, 3G, 4G and other data services).

Card Stickers/built-in card stickers: Card sticker is to crack the lock phone to enable it to support mobile Unicom Telecom mobile phone card common methods. Card paste through the actual mobile phone card and mobile card slot in the middle of adding a small chip to connect, and sometimes with the relevant plug-ins on the phone, the phone to crack, so that the normal use of mobile phone card. There are certain limitations in the unlocking of cards, such as when connecting cellular networks, it is often necessary to turn on the data roaming function, the network connection may appear the signal is not very stable situation and so on. In addition, a sticker can usually only support certain versions of the iOS system, and if the system is upgraded, the card may fail. And the built-in card paste, is usually some bad business, the card chip directly welded to the inside of the phone, so it seems that the phone and no lock. But once the system upgrade card paste failure situation, it is difficult to replace the card paste, because the inside of the mobile phone, very small, self-removal requires higher welding technology.

　　

Built-in card to judge: Internal card sticking judgment, on the one hand, from the cell phone card slot to look inside, if you can see some of the copper wire used to connect the card chip, the internal card stick. On the other hand, if the phone does not have a SIM card installed, the phone without the card will show no SIM card, but the built-in card placement opportunity shows no service, and often try to search for signals every once in a while (presumably because the card chip itself is a SIM card simulation of some functions, internal card mounter even without card, The phone will still detect the card chip and consider it a SIM card.

　　

Baseband: (quoted here as Baidu knows an answer) "baseband" is a total nickname to name some parts of the iphone inside, baseband is used to manage the phone and internet access of the iphone. Baseband is a very small, very special standalone computer system that runs inside the iphone. It runs separately from the main system that controls the iphone software (email, Google Maps), and it communicates with the iphone's main system through the internal network. Imagine that he is a modem or other non-major component, and it will occasionally need to be updated within your system. When a software update is released, the new update will upgrade your baseband with itunes (fix bugs or add new features). 3.1 Update for such an update, so run the normal update through itunes directly will be the new adaptation and upgrade your baseband.

SOURCE Link:

Http://zhidao.baidu.com/link?url=F7NhlChq7fwLmfAg7W8X4PmMO3ZtpoaKFL5fv5wva2N2Ydh8mn_pz_zrYxlAMzrLKv53GyzYt_EzIS4SE4HsvK

An article to popularize all kinds of basic knowledge of iOS