[Guide] How to turn S7 single SIM to S7 dual SIM [Exynos phones]

[theogritzi]

Hello,

Requirements:

• Phone must be rooted
• Need a gsm software: Z3x, Chimera, Octopus or GCKey
• Make a phone backup of efs and certificate

Steps:

1. Connect your phone to usb (make sure oem unlock and usb debuggin is on)
2. Make DM+MODEM+ADB connection allowed by calling *#0808#
3. Read your phone certificate using a gsm box
4. Open your phone certificate and duplicate everything seen after IMEI line by copying and adding 2.(example IMEI2, Pubsignkey2 etc)..Write back your new phone certificate
5. Your phone is now dual sim

Mentions:

• This won't change your IMEI so it won't trigger law in countries where IMEI changing is illegal.
• In case you don't have gsm box or you need help you can contact me on : justbily2308@gmail.com
• I tested and done it on multiple exynos versions(g930f, g930w8) and it worked.