.cef * .fin error decrypt

Hi, I hope you can help me because im totally lost. Im newbie in oracle flexcube!
With python im getting those errors and i believe because the files were created in oracle flexcube banking core

Basically i try to import this bellow into oracle flexcube … but i cant find how…
Can you advice please? or help me to find another solution?

1. Open CEF File --------------> dont know where to put this file in flexcube
Use the RSA KEY to decrypt the CEF FILE

2.Convert File
Utilize LIBCEF.DLL to convert the decrypted file

  1. Generate JSON
    Upon successful conversion, a json file will be generated

THANKS IN ADVANCE