How to pull boot.img and recovery.img from Sony Xperia E4 Dual?
Use this tool to pull from a PC
MTK Droid Tools Latest.zip

And for Android.. Use a backup tool like Flashify on PlayStore  

Flashify PlayStore Link

and go to backups, Backup Kernel And Recovery..
Then navigate to internal storage > android > com.cgollner.flashify > files > backups And copy the files...

These files may be called boot.emmc.win and recovery.emmc.win,
 These files need to be renamed to .img and they flash.. On my mtk this works...