Shortly after the iPhone (then also the iPod Touch) was released, hackers were able to "jailbreak" the device through a TIFF exploit. The application installed for this vulnerability allows users to download an official selection of third party programs. Jailbreak the iPod Touch was the only way to get third-party programs when running OS 1.1.x.
These third-party programs can use the additional functionality is not supported by Apple (such as activation of multitasking, the application of the themes for the home screen, or enable a percentage indicator on the battery). All officially released IOS versions 3.1.2 through even 4.3. 3 with some errors, you can unlock, but version 4.3.1 could not at that time was the 4.3.x firmware is jailbreak untethered by @ released.Recently i0nic. The service of an iPod Touch after jailbreaking or modifications made by unofficial means is not covered by Apple's warranty (however, the jailbreak process is easily undone by performing a restore through iTunes). Today all jailbreak iPod Touch 1.1.1 firmware can to 5.0 (4.3.4 and 4.3.5 jailbreak stuck in semi-captivity and 5.0)
On July 7, 2011, Apple announced that new versions of IOS software, a security problem to be fixed. Users who install their own software from Apple without protection can have your information stolen or malware unwitttingly download by clicking on certain PDF files. This discovery of "critical weaknesses" was made by the German Federal Office for Information Security.
