Sm-a300fu cert write error

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. Select device in ADB settings.
5. Press ‘Read EFS’ button to read backup or ‘Write EFS’ to restore or
press ‘Write CERT’ to restore certificates.

To backup/restore QCN, phone diagnostic port must be enabled.
1. Power on the phone.
2. Type *#0808# and select ‘DM+MODEM+ADB’.
3. Type *#9090# and select ‘DM/DUN over HSIC’.
Or use ‘Activate Diag’ function from ‘Repair’ tab.
4. Connect phone to PC with USB cable, install drivers if needed.
5. Select diagnostic port in port settings.
6. Press ‘Read QCN’ button to read NV backup or ‘Write QCN’ to restore.

Operation: Write CERT
Selected model: SM-A300FU
Selected port: COM30 SAMSUNG Mobile USB Serial Port
Software version: 26.9

Checking CERT file… OK
KEY ID: 0956
Waiting ADB device… OK
Reading phone info…
Model: SM-A300FU
Android version: 5.0.2
Product code: SM-A300FZWUXFV
Phone version: A300FUXXU1BOJ4
PDA version: A300FUXXS1BPE1
CSC version: A300FUWIN1BOK1
CSC country code: ITALY
CSC sales code: WIN
HW version: MP 0.200
Phone SN: R58G8286N2E
Modem board: MSM8916
RF cal date: 2015.02.12
Writing AT RIL… OK
Initialization AT RIL… error (11)

Done with Samsung Tool PRO v.26.9