Phone must be rooted!
If the software can't root the phone automatically,
then you must root your device manually.
1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Press 'Read EFS' button to read backup or 'Write EFS' to restore or
press 'Read CERT' button to read certificate or 'Write CERT' to restore certificates.
Operation: Write CERT
Selected model: SM-G920I
Software version: 21.4
Checking certificate file... OK
KEY ID: 0346
Waiting ADB device... OK
Reading phone info...
Android version: 5.0.2
Phone version: G920IDVU1AOBQ
PDA version: G920IDVU1AOBQ
CSC version: G920IKSA1AOBM
CSC country code: KSA
CSC sales code: KSA
Modem board: SHANNON333
RF cal date:
Checking Super user right... true
Reading nv data... OK
Checking magic... error
Security damaged (1)
plz help me phone new emergency calls