G531F i tried unlock now imei is null

I have g531f for unlock, phone rooted

1 I make backup CERT FILE

Platform: Samsung Android
INFO : 03/03/2016 06:12:12 p.m. > Selected port: COM9
INFO : 03/03/2016 06:12:12 p.m. > Selected model: SM-G531F
INFO : 03/03/2016 06:12:13 p.m. > ADB server killed.
WARN : 03/03/2016 06:12:13 p.m. > Please, press "OK" button on the phone to allow USB debugging..
INFO : 03/03/2016 06:12:18 p.m. > Detected phone model: SM-G531F
INFO : 03/03/2016 06:12:18 p.m. > Firmware compiled date: Sat Jun 13 21:07:21 KST 2015
INFO : 03/03/2016 06:12:19 p.m. > PDA version: G531FXXU1AOF7
INFO : 03/03/2016 06:12:19 p.m. > CSC version: G531FMEO1AOI2
INFO : 03/03/2016 06:12:20 p.m. > SW version: Unknown
INFO : 03/03/2016 06:12:22 p.m. > Phone SN: RV8GB1EK4CA
INFO : 03/03/2016 06:12:22 p.m. > Android version: 5.1.1 (LMY48B)
INFO : 03/03/2016 06:12:22 p.m. > Cheking Root
INFO : 03/03/2016 06:12:22 p.m. > Phone is Rooted
INFO : 03/03/2016 06:12:22 p.m. > Reading Certificate…
INFO : 03/03/2016 06:12:39 p.m. > Certificate read successfully
INFO : 03/03/2016 06:12:40 p.m. > Performed by 2.2.1 software version

2 I tried unlock

Platform: Samsung Android
INFO : 03/03/2016 06:12:45 p.m. > Selected port: COM9
INFO : 03/03/2016 06:12:45 p.m. > Selected model: SM-G531F
INFO : 03/03/2016 06:12:47 p.m. > Detected phone model: SM-G531F
INFO : 03/03/2016 06:12:47 p.m. > Firmware compiled date: Sat Jun 13 21:07:21 KST 2015
INFO : 03/03/2016 06:12:47 p.m. > PDA version: G531FXXU1AOF7
INFO : 03/03/2016 06:12:48 p.m. > CSC version: G531FMEO1AOI2
INFO : 03/03/2016 06:12:48 p.m. > SW version: Unknown
INFO : 03/03/2016 06:12:50 p.m. > Phone SN: RV8GB1EK4CA
INFO : 03/03/2016 06:12:50 p.m. > Android version: 5.1.1 (LMY48B)
INFO : 03/03/2016 06:12:50 p.m. > Cheking Root
INFO : 03/03/2016 06:12:51 p.m. > Phone is Rooted
INFO : 03/03/2016 06:12:55 p.m. > Deactivating MSL…
INFO : 03/03/2016 06:13:04 p.m. > Performed by 2.2.1 software version

3 Now my phone is imei NULL NULL

4 RESTORE BACKUP CER FILE

Platform: Samsung Android
INFO : 03/03/2016 06:57:16 p.m. > Selected port: COM9
INFO : 03/03/2016 06:57:16 p.m. > Selected model: SM-G531F
INFO : 03/03/2016 06:57:17 p.m. > ADB server killed.
INFO : 03/03/2016 06:57:19 p.m. > Detected phone model: SM-G531F
INFO : 03/03/2016 06:57:19 p.m. > Firmware compiled date: Sat Jun 13 21:07:21 KST 2015
INFO : 03/03/2016 06:57:19 p.m. > PDA version: G531FXXU1AOF7
INFO : 03/03/2016 06:57:20 p.m. > CSC version: G531FMEO1AOI2
INFO : 03/03/2016 06:57:20 p.m. > SW version: Unknown
INFO : 03/03/2016 06:57:22 p.m. > Phone SN: RV8GB1EK4CA
INFO : 03/03/2016 06:57:22 p.m. > Android version: 5.1.1 (LMY48B)
INFO : 03/03/2016 06:57:22 p.m. > Cheking Root
INFO : 03/03/2016 06:57:23 p.m. > Phone is Rooted
INFO : 03/03/2016 06:57:23 p.m. > Preparing…
INFO : 03/03/2016 06:57:29 p.m. > Writing Certificate…
INFO : 03/03/2016 06:57:32 p.m. > Selected file: F:\S5 GB-KEY-02-2016\herctor B. pagados 10 04-02-2016\Cert-SM-G531F-354609073xxx-RV8GB1EK4CA.cert
INFO : 03/03/2016 06:57:32 p.m. > Checking Certificate file…
INFO : 03/03/2016 06:57:32 p.m. > Certificate file successfully checked
INFO : 03/03/2016 06:57:32 p.m. > Finalizing…
INFO : 03/03/2016 06:57:37 p.m. > Certificate has been written successfully
INFO : 03/03/2016 06:57:37 p.m. > Please, restart the phone to apply changes
INFO : 03/03/2016 06:57:37 p.m. > Performed by 2.2.1 software version
Log file "C:\Program Files\Octoplus\Octoplus_Samsung\LOG-03-2016_18-56-49.log" closed (03/03/2016 06:58:50 p.m.).

But my phone still null null