SPH-L720 unlock problame

Welcome to Octoplus/Octopus Box Samsung software version 2.1.9
———————————————————————————–
To connect SCL24 phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
6. Go to dial window.
7. Enter "*#0808#" number.
8. Select "DM+Modem+ADB".
9. Press Home button.
10. Restart phone.
11. Press "Read Info" in software.
———————————————————————————–
To connect SPH-L720 phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
6. Go to dial window.
7. Enter "*#0808#" number.
8. Select "DM+Modem+ADB".
9. Press Home button.
10. Go to dial window.
11. Enter "*#9090#" number.
12. Set "Diag config" to "[1]DM/DUM over HS-USB" value.
13. Restart phone.
14. Press "Read Info" in software.
———————————————————————————–
Platform: Samsung Android
Selected port: COM1
Selected model: SPH-L720
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SPH-L720
Firmware compiled date: Sat Oct 19 13:46:05 KST 2013
PDA version: L720VPUEMJA
CSC version: L720SPTEMJA
SW version: L720VPUAMDC
Phone IMEI: B0000000
Phone SN: 00000000000
Android version: 4.3 (JSS15J)
Checking Root:
Phone is Rooted.
Reading security backup, please wait…
Can’t get superuser aceess. Please, repeat opperation once againe and press "Allow" button on the phone every time when superuser dialog appears.
Installing service app…
Installing app failed
Phone unlocking failed

Root phone correctly with with iroot