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Firmware
Unless otherwise stated, the jailbreak and unlock information report whether a device can be modified with publicly available software (read: no additional hardware required) if it was never jailbroken before. iTunes contacts ax.phobos.apple.com to check for updates.
Beware of scams that repackage freely available jailbreaks! Only use legit jailbreaks.
Apple TV
Firmware/Apple TV 2G Firmware/Apple TV 3G
iPad
Firmware/iPad 2 Firmware/iPad 3 Firmware/iPad 4
iPad mini
iPhone
Firmware/iPhone 3G Firmware/iPhone 3GS Firmware/iPhone 4 Firmware/iPhone 4S Firmware/iPhone 5
iPod touch
Firmware/iPod touch 2G Firmware/iPod touch 3G Firmware/iPod touch 4G Firmware/iPod touch 5G