a800f write cert failed

i av a800i both ime is 3500000000006 i av tried to write cert file without success error 9

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.
6. Press ‘Read CERT’ button to read certificates or ‘Write CERT’ to restore.
7. Press ‘Write NV DATA’ if you need to restore NV backup.

Operation: Write CERT
Selected model: SM-A800F
Software version: 26.9

Waiting ADB device… OK
Reading phone info…
Model: SM-A800F
Android version: 5.1.1
Product code:
Phone version: A800FXXU1APD2
PDA version: A800FXXU1APD1
CSC version: A800FODD1APD1
CSC country code: India
CSC sales code: INS
HW version:
Phone SN:
Modem board: SHANNON333
RF cal date:
Checking Super user right… true
Initialization zTool… OK
Running zTool, please wait…
Start… OK
Initialization… OK
Generate and check client proof… OK
Verify proof by client… OK
Reading data… error (9)

Done with Samsung Tool PRO v.26.9