If your device currently has a software version prior to 2.0 (1.x) and you are updating to software version 2.0 or later, all data on your device will be erased in order to perform install the new. Follow the steps below to downgrade ios 4.2 to 4.0.1/4.0 firmware on iphone and ipod touch. ios 4.2 is not jailbreakable atm. so, if you want to jailbreak iphone 4 , 3gs, 3g or ipod touch 4g 3g, 2g then you must downgrade to ios 4.1 or 4.0.1 first.. Finally ios 4.2.1 is out, after much anticipation and await. this firmware update brings some multitasking, folders, gameplay to ipad and airplay, airtunes, free find my iphone service (for iphone 4, ipod touch 4g, ipad) for all ios compatible idevices..
Question: q: update iphone 3g ios 4.2.1 to later version i have just acquired an iphone but none of the apps i am interested in will run on the installed ios 4.2.1 installed. the model number is a1241, 8gb.. When your iphone is in operating mode, hold down shift key on your keyboard for windows, and alt key on your keyboard for mac, and then click restore button in itunes and locate the file "iphone. Mobile cell phones wireless notebook gadgets computer hacks technology music player iphone ipad ipod touch jailbreak unlock devteam new untethred 4.2.1 on ipt4g untethered 4.1 4.2 4.0 4.0.3 4.0.1.