Downloaded iTunes firmware are located in different directories depending on operating system version. In Windows XP, the updates stored in the directory Documents and Settings – User – Application Data – Apple Computer – iTunes – Software Updates. You can go to this folder by using the "My computer" - "Local disk C:".
In Windows Vista, 7 and 8, this folder is in the directory Users – User – AppData – Roaming – Apple Computer – iTunes – Software Updates the C: drive. Go it, you can by selecting menu "start" - "Computer" - "Local disk C:". Directory User name matches the user name that you use in the system.
You can copy the files in the data folders on a separate data carrier. To do this, select the files available in the directory, right click on selection and select "Copy". Follow the procedure to insert the folder of your flash card, using the same context menu.
For data recovery firmware after system reinstallation or complete removal of iTunes copy data files to the corresponding directory of the program. Using these files, you will also be able to perform updates without an Internet connection or the lack of backups in case of failures in the software of your Apple device.
Before flashing the device it is necessary to create a backup of the data so as not to lose the contact list, downloaded music, and other files. To do this, connect your device to computer, launch iTunes, click on the name of your device with the right mouse button. In the opened context menu select "Create a copy". You will then be able to carry out any operation with the device without losing data.
Data firmware can be useful if you want to jailbreak a device.