First you need to know what your device is:

1. Locked / Contract / Lock - The device tied to a specific operator, purchased at a low price due to the fact that it works only with this operator, to sewonlywithout raising the modem
   
2. Unlocked Forever / Neverlock - I have never been locked under the operator and will not be blocked when reflashing, you can sew quietly.
   
3. Works under any SIM Card / Sim-Free - It will not be blocked when reflashing, you can sew easy.
   

• You can find out if the device is locked or not here:http://iphoneimei.info
  
• Find out on which operator your device is locked to help here:Determination of the operator of a locked iPhone by IMEI
  

Process for phonesnot tiedto the operator is simple:

1. Download the latest official software (you can download it hereOfficial firmware for iPhone / iPod / iPad)
   
2. Connect your device to PC or MAC
   
3. Run iTunes
   
4. Press SHIFT (for Windows) or ALT (for MAC OS) on the keyboard and pressUPDATE
   
5. iTunes prompts you to select a file of previously downloaded software (.IPSW)
   
6. We confirm the choice and wait for the end of the firmware process
   

If after all your phone is locked, then go to this topic:

• Creating custom firmware
  

Extremely carefully study the cap of this topic. :

• [FAQ] Rollback and unlock instructions
  

1. Turn off the machine
   
2. PinchingHome + Powerand hold exactly 10 seconds
   
3. Then lower the buttonPower, butHomekeep on holding another 15 seconds.
   
4. In this case, the screen should be black!
   
5. The PC will detect your device in modeDFU Mode
   

You can see more clearly in the video:How to put the device into DFU mode

If your device is “dead” and the battery has sat down, then there are 2 outputs:

1. Enter the phone in the Recovery Mode and leave for at least 30 minutes.
   
2. If the Recovery Mode is not feasible, then we buy the Universal Frog Charger and do a manual start of the battery.
   

In DFU-Mode, the device does not charge

Extremely carefully study the cap of this topic. :

• The current state of the possibility of the procedure Unlock
  

Extremely carefully study the cap of this topic. :

• Guide to jailbreak instructions
  

Serial numbers are displayed as AABCCDDDEEF where:

1. AA - identification data of the plant;
   
2. B - year of production (simplified to the last digit, for example: 2010-0, 2011-1, etc.);
   
3. SS - week of production;
   
4. DDD - unique identificator;
   
5. EEF - iPhone model, color and memory size.
   

• VR0 (iPhone 2G Silver 4GB)
  
• WH8 (iPhone 2G 8GB Silver)
  
• 0KH (iPhone 2G 16GB Silver)
  
• Y7H (iPhone 3G 8GB black)
  
• Y7K (iPhone 3G 16GB black)
  
• 3NP (iPhone 3GS 16GB black)
  
• 3NR (iPhone 3GS 32GB black)
  
• 3NQ (iPhone 3Gs 16GB White)
  
• 3NS (iPhone 3Gs 32GB White)
  
• A4S (iPhone 4 Black 16GB)
  
• A4T (iPhone 4 Black 32GB)
  

For example, the serial number79049XXXA4S : factory 79 (presumably Foxconn), was manufactured in 2010 year on 49 week, black 16GB iphone 4 .
Note: It’s not quite clear what the last three characters mean for all white iPhone 4 models. So if you have any information on this, let us know.
Unfortunately, Apple has changed the iPhone CDMA 4 generation serial number, so it is not correct for iPhone CDMA 4 and iPhone 4S.

It’s easy to distinguish iPhone 3GS with the new bootrom by serial number. It is necessary to take the third, fourth and fifth of its numbers. The third digit encodes the year of production (9 = 2009th, 0 = 2010th, 1 = 2011th), the fourth and fifth - the serial number of the week of the year on which the iPhone was released (from 01 to 52). The first iPhone 3GS with a new bootrom began to appear in the 40th week of 2009, and from the 45th week the new bootrom began to be used in all released iPhone. Thus, if the third digit of the iPhone 3GS serial number is 0 or 1, it definitely has a new bootrom. If the third digit is 9, you need to look at the fourth and fifth digits. If they are less than or equal to 39, butrom is exactly old, if greater than or equal to 45, butrom is exactly new.

You can check the serial number of the iPhone 3GS without turning on the device, as The serial is printed on the SIM card tray. However, this is not a very reliable method, especially when buying, because tray is easy to replace. You can find out the serial number either in iTunes (on the main property page of the device), or on the device itself, in the menu “Settings-Basic-About this device-Serial number”.

Or download a program to determine the version of butromiDetector.exe(186.5 KB)

File recovery from official Microsoft site : http://support.microsoft.com/kb/972034/en-ru
Download and unzip : hosts.zip (557 bytes)