Tested with CPH1707EX, CPH1611EX OTA Zip and Python 3.6

• ozipdecrypt.py : Decrypt Oppo .ozip to .zip
• decrypt.py : Decrypts any part of the firmware

Based on python 3.6

'pip install pycrypto'

• OTA OZIP decryption: 'python ozipdecrypt.py CPH1707EX_OTA_0070_all.ozip'

File will be output as .zip

Share, modify and use as you like, but refer the original author !

For a tutorial on aes key extraction, head over here.