If you’re trying to download and install iOS 8.4 to check out Apple’s new music streaming service but your iPhone is telling you you don’t have enough space, you might not need to scramble to delete apps and photos.
The secret is iTunes. If you plug your iPhone into iTunes, you won’t need as much free space, only about 610 megabytes. This is how people used to update the iPhone in the old days before we could update iOS “over the air,” or OTA.
Plug your iPhone into your computer and launch iTunes to get started.
1. If a popup notification appears telling you to that a new version of iOS is available, go ahead and click Download and Update and go to step 5.
5. Click Continue when this popup about purchased items appears. You won't be able to update if you click cancel.
9. If you have a passcode for your iPhone, you'll need to enter it just like you would when you unlock it. Then click Continue.
11. Your iPhone will eventually reboot and install the update. If your iPhones disconnect from iTunes and a popup appears saying your 'session ID is missing,' just click OK and let your iPhone finish restarting.
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