hanged on boot logo as mixed gingerbread and jellybean

[Akkiman]

hi, I had newly installed a jelly bean rom
then i was checking new features.after sometime i opened the system folder then i opened framework folder.there was my old ANDROID software i opened it.i replaced the application.after that i noticed that all the processes are stopping unexpectedly i removed the battery and then switched on my a57 then there was no booting except the logo of a57.it was hanged there.
i started charging then then the boot logo occured again and there was the blank white box in the middle
I think it was the mixing of gingerbread and jellybean
PLEASE HELP ME. I AM IN A BIG TENSION.
i didnt told this to someone except you

 

[Hadron]

Go into recovery and reinstall the Jelly Bean ROM. That will undo any changes you made to the system.

 

[Prepaidguy9081]

Make sure to wipe data, cache, and dalvik cache to remove the old system (s) before installing the new one.

Make sure you have the most up to date recovery for your phone.

Make sure you do not need firmware upgrades and just the rom is ok, otherwise do firmware upgrades first to go from gb to jb