I have attempted to restart my phone and am currently debating reinstalling iOS 8.3. Suggestions?
Did you use iTunes on your computer to update the iPhone?
Use iTunes to restore your iOS device to factory settings - Apple Support
I updated it without connecting it to my computer.
Try to update it again, follow the steps mentioned in the article above. This will put the whole software package onto your phone.
When I plug in my phone and click on "check for updates", iTunes says "This version of the iPhone software (8.4) is the current version."
Sorry for being unclear, you'll have to click the button "Restore iPhone", in order to erase the phone and download a fresh iOS version.
Restore your device
- Connect your device to your computer using the cable that came with it.
- Select your iPhone, iPad, or iPod when it appears in iTunes.
- In the Summary panel, click Restore.
- Click Restore again to confirm that you want to restore your device to factory settings and delete all data and content. iTunes will download the device software file and restore your device.
- After your device is restored to factory settings, it will restart. When it does, you’ll see the "Slide to set up” welcome screen. Follow the steps in the device Setup Assistant. You can set up your device as new or use a previous backup. If you restored an iOS device that has cellular service, it will activate after you finish setting up your device.
copied from Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support
Updated my iPhone 6 to iOS 8.4 and my iTunes didn't update.
