These are the instruction to downgrade Samsung Galaxy Core Duos I8262 using Odin Software on Windows Computer.
Remember: Your Samsung Galaxy Core Duos I8262 should have 30 percent or more battery to perform the downgrading process.
For Example: We are from India, so we have downloaded the Indian Samsung Galaxy Core Duos I8262 firmware. Likewise you have to download the firmware of your country and add it in Odin AP.
Flashing usually takes 1-2 minutes to complete the downgrading process on your Samsung Galaxy Core Duos. Once Rooting process got completed, you will be able to see a Green Box with Pass written on it in Odin. During this process phone will re-boot automatically.
[*] Downgrade is Data Loss process: If you follow the above tutorial then you may loss your personal data on phone like contacts, pictures, music, videos and installed applications. We recommend you to always take backup of your phone before following downgrade procedure.
[*] Phone Stuck at Boot Logo: After downgrading, your Samsung Galaxy Core Duos might Stuck at the Boot loop. In this Situation Boot your Phone in Recovery Mode (Volume Up+Home Button+Power Key) and Wipe the Data then restart the device.