Updating iphone 3g to 4

Bear in mind that updating can slow down your device.

No ,you can't update the the i OS 4.2.1 to i OS 5 in i Phone 3g.

All this does is wipe your device clean, so that i OS 4 can be installed on a spick-and-span i Phone 3G. Just make sure your backup has run before you initiate the restore!

To make things even easier, if you’ve already been greeted with the i OS 4 update option (you should have seen this when you checked for updates), when you click the ‘restore’ button you should notice a ‘Restore and Update’ button.

See the chart below to determine whether you can upgrade your device and what you can upgrade to.

You will have to connect your device to your computer and open i Tunes in order to upgrade. See the chart below to determine whether you can upgrade your device and what you can upgrade to.

To avoid this, it was suggested one restore their i Phone 3G first. You should be greeted with a notice that i OS 4 is available. Before you install you’re going to want to ‘restore’ your device.Ultimately Apple released updates to the OS that improved performance on the i Phone 3G.I have an Iphone 3g spare in the house but realised that it is on IOS 4.2.1 I really need to know whether it can be updated there must be a way.IPhone, i Pod Touch, and i Pad i OS Compatibility Chart i Phone 1 i OS 3.1.3 i Phone 3G i OS 4.2.1 i Phone 3GS i OS 6.1.x i Phone 4 i OS 7.1.x i Phone 4S i OS 9.x.x i Phone 5 i OS 9.x.x i Phone 5c i OS 9.x.x i Phone 5s i OS 9.x.x i Phone 6 i OS 9.x.x i Phone 6 Plus i OS 9.x.x ------------------------------------------------------- i Pod Touch 1 i OS 3.1.3 i Pod Touch 2 i OS 4.2.1 i Pod Touch 3 i OS 5.1.1 i Pod Touch 4 i OS 6.1.x i Pod Touch 5 i OS 9.x.x ------------------------------------------------------- i Pad 1 i OS 5.1.1 i Pad 2 i OS 9.x.x i Pad 3 i OS 9.x.x i Pad 4 i OS 9.x.x i Pad Mini & Mini Retina i OS 9.x.x i Pad Air i OS 9.x.x ===================================== Select the method most appropriate for your situation. Upgrading i OS It depends on the device you are using. If it is before i Phone 5, you will not be able to update your device to i OS 10.3 (the latest.) If it is an i Phone 5 you are able to update it to the latest. If you would like to upgrade your ios, follow these steps.

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