How to retrieve contacts and pictures if cannot reboot

If you have an iCloud account and stored your iPhone data on another iOS device, you may restore the files from iCloud backup:

Once you realized the data loss from your iPhone, turn off the Internet immediately to stop the automatic synchronization on all your iOS devices. Then go to the other iPhone or iPad or iPod touch to restore its backup from iCloud. After that, you can turn on the Internet and sync the data to your iPhone to retrieve the files on your iPhone.

If that way doesn't work, I'm afraid you need to use a professional 3rd party application to help you retrieve your iPhone data. Maybe the tips here can give you some hints: How to Recover Lost Contacts from iPhone 5

BTW, purchasing expensive data recovery software like that is a last resort method. So you'd better give it a try to make sure it's a trusted program and works fine for you. Good luck.

If you did backup the contacts and pictures on your iPhone 5 you can retrieve them from iTunes or iCloud backup. Here are detailed steps you can follow:

1. Recover iPhone data from iTunes backup

(1) Connect the iPhone to the computer with a USB cable.

(2) Open iTunes.

(3) If you have a new or erased iPhone, iTunes will prompt you to restore from backup.

(4) Otherwise, Control-click on your iPhone under DEVICES in the left menu.

(5) Select Restore From Backup...

(6) Choose the backup you wish to sync and click the Restore button.

2. Recover lost iPhone data from iCloud backup

(1) Make sure your iPhone is connected to Wi-Fi and plugged into the charger.

(2) Select the option Restore From iCloud Backup.

(3) Enter your iCloud account and password.

(4) Choose the recent backup you wish to restore to your iPhone.

(5) Enter any passwords required when prompted.

Also you can use a third-party tool like iPhone Data Recovery to recover the data.

Recover lost contacts and photos could be very easy, if you get an iPhone data recovery, you can directly scan your iPhone and get back the lost data, in addition, you can also extract them from iTunes and iCloud backup if you sync your iPhone to iTunes or iCloud before.