I don't want to waste your time so I am coming directly to the point. This is the tutorial on installing theme on your Samsung Corby S3650/S3653 by flashing and patching your mobile.
PLEASE DO IT ON YOUR OWN RISK.!!!!!! IF ANYTHING HAPPENS TO YOUR MOBILE, I WON'T BE RESPONSIBLE FOR ANY DAMAGE!!!
AND PLEASE BE CAREFUL..... ANY MISTAKE IN THE PROCESS CAN MAKE UR MOBILE DEAD!!!!!!!!!!!!
SO LETS GET STARTED.....
SAFETY FIRST - Make sure that you backup all your files, messages ,contacts, etc. from your phone.
Now first check your mobile firmware by typing *#1234# in the keypad.
If it is S3650XEIJ2 then its OK but if it is other than S3650XEIJ2 then don't worry, you need to first update your firmware to S3650XEIJ2.
Now for those who don't have S3650XEIJ2 firmware they should first update their firmware.
Go to this page for tutorial on updating firmware - https://www.instructables.com/id/Updating-firmware-of-samsung-corby/
For those who have S3650XEIJ2 firmware, continue....
Download these files-
Firmware (S3650XEIJ2) - http://www.mediafire.com/?ogmzmgzdj5l
Multi loader v5.56 - http://www.4shared.com/file/TAf-S0eQ/MultiLoader_V556.html
Theme (Android Jellybean 4.1) - http://www.4shared.com/zip/Vj3wa2jh/Samsung_Corby_Jelly_Bean_41_by.html
Patch - http://www.4shared.com/file/LZOJeQTf/jellybean41.html
Amss_patch.bin - http://www.4shared.com/file/2XGGKIUY/Amss_patch.html?
My 5 favourite themes- http://www.4shared.com/zip/IG6RgzGD/Themes_for_corby.html?
Locks for Corby- http://www.4shared.com/zip/kGZOOQp2/Locks_for_corby.html?