Files with deviceinfo extension are used for Apple iPhone Configuration utility. They include some information about iOS device configured by iPCU.
Software that open deviceinfo file
DEVICEINFO file extension - Apple iPhone Configuration Utility file
What is deviceinfo file? How to open deviceinfo files?
File type specification:
The DEVICEINFO file extension is associated with the Apple iPhone Configuration Utility application for Mac and Windows that allows users to create, maintain, encrypt, and install configuration profiles to iOS devices. The .deviceinfo stores various information about iOS device configured by iPCU.
The default software associated to open deviceinfo file:
iPhone Configuration Utility for Windows 
(obsolete software)
Company or developer:
Apple, Inc.
iPhone Configuration Utility is used to create configuration profiles for iPhone, iPod Touch and iPad. Configuration profiles are XML files that contain device security policies, VPN configuration information, Wi-Fi settings, APN settings, Exchange account settings, mail settings, and certificates that permit iPhone, iPad and iPod touch to work with your enterprise systems.
Company or developer:
Apple, Inc.
Apple Configurator allows users to quickly configure large numbers of devices with the settings, apps, and data specify for students, employees, or customers. It is able to configure iOS updates, lock screen and wallpaper, device name, installed apps, installed documents, configuration profiles (including passcode policy, restrictions, Wi-Fi, VPN, and other settings), mobile device management (MDM) solution enrollment etc.
iPhone Configuration Utility for Mac OS X 
(obsolete software)
Company or developer:
Apple, Inc.
iPhone Configuration Utility lets you easily create, maintain, encrypt, and install configuration profiles, track and install provisioning profiles and authorized applications, and capture device information including console logs. The iPhone Configuration Utility is available for OS X Mountain Lion and earlier versions.
OS X Mavericks and later uses Apple Configurator software for same purposes.
List of recommended software applications associated to the .deviceinfo file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open deviceinfo file, edit deviceinfo file, convert deviceinfo file, view deviceinfo file, play deviceinfo file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with deviceinfo file - Apple iPhone Configuration Utility file
Click on the software link(s) for more information. Suggested software applications use deviceinfo file type for internal purposes and/or also by different way than common edit or open deviceinfo file actions.
Microsoft Windows:
iPhone Configuration Utility for Windows (obsolete/discontinued)
Apple macOS / Mac OS X:
Main software associated with deviceinfo file by default:
Apple Configurator
iPhone Configuration Utility for Mac OS X (obsolete/discontinued)
