What you need to have is……..
1) Winrar (To OPEN APK FILE)
2)LIB Files of Unity Engines
3)APK SingerDownload Links:
Download A TO Z LIB Files (57 MB)
Download APK Signer (400 KB)
1) Using Winrar OPEN the APK File and head to Assets>Bin>Data> and Open “MAINDATA” file using NOTEPAD or NOTEPAD++
2) Now Check the Version of Unity (Check the Screenshot for more info)
3) Now you have the info about the Unity Engine Version, in our case it is 3.5.6f4 so now you have to extract 3.5.6f4 libs which you have downloaded from above links.
4) Now using winrar Delete LIB Folder from APK file and Place ARMv6 lib folder now head to Assets>Libs and delete ARMv7 folder and place the armeabi-vfp. now we are almost done.
5) Now using APK Signer sign the APK and you are done.
NOTE: If you find Unity Engine Version 4.0 or above it means its dead end and those games can not be converted.