When going to a sufficient number of patches, Apple releases update – IPSW file size of about 150 megabytes, which contains the image of the phone operating system and sometimes update for GSM-part. Consequently, in a single update may be two "flash": For the software part phone (Updating Applications) for GSM-part. This package has a version (1.0.0, 1.1.1, 1.1.2, etc.), but a GSM-part has its own numbering (03.01_13G, 04.02_13G, etc.). It turned out that the program installed in the phone itself, characterized by a version of the package updates, such as the latest version is 1.1.3. This is called "firmware version the phone." It just so happened that the phone can be set to any of the existing updates with the firmware version of the GSM-no change.
You can have the firmware for the GSM-version of the firmware and the phone 04.03_13G 1.0.2. Now re-read several times the previous two paragraphs. Of these, we have learned two basic terms: phone firmware and firmware of the GSM-. Their version is very dependent a lot. But in light of recent events on the stage there is one more term: version bootloader'a. This question deserves a separate discussion.
Bootloader, secpack, OTB, and unlock all-all-all C the release of the update numbered 1.1.2, was discovered a very unpleasant fact. All phones available for sale with this firmware (as they say out of the box 1.1.2 – 1.1.2 out the box, OTB) are different from the previous bootloader. New loader version 4.6, whereas the previous version was 3.9.