Apple DFU mode, recovery mode or in other words programming mode is a special configuration of an apple device(iPhone, iPad or iPod) designed for system access, firmware updates etc. This can also be used to save, fetch SHSH blobs restore and jail-brake process as well. Most of the Firmware update programs and tools automatically exit your phone from DFU mode once the update process is finished. But if they doesn’t or if you accidentally enabled it following steps can used to get out of the DFU mode.
1) locate the power button and home button
2) press and hold the power and home buttons simultaneously.
3) wait for 5 seconds and release the buttons.
4) Your i device should automatically shutdown and restart with normal mode.