A wide range of issues could possibly cause an i Phone to go into recovery mode.
The most common issues that could cause this have to do with the Operating System (OS) itself.
Drag the IPSW file to the Firmware folder, located here: ~/Library/Containers/com.apple.configurator/Data/Library/Caches/com.apple.configurator/Firmware/ When you place an IPSW file in the Firmware folder, Apple Configurator does not download that version of the software from the Internet.
However, if i Tunes has already downloaded that version to the user's i Tunes Library, Apple Configurator uses the version in the i Tunes Library.
Manually save any other data off your phone that you may want, such as your Camera Roll.