Write Cert on samsung galaxy A3 SM-A300FU

Checking CERT file... OK
KEY ID: 0956
Waiting ADB device... OK
Reading phone info...
Model: SM-A300FU
Android version: 4.4.4
PDA version: FA44_A300FUXXU1AOH1
CSC version:
Phone version: A300FUXXU1AOC2
Product code: SM-A300FZSUO2U
CSC country code:
CSC sales code:
Phone SN: R58G20M8WTN
IMEI: 356570067292476
HW version: MP 0.200
RF cal date: 2015.02.08
Chip name: MSM8916
Modem board: MSM8916
Boot Warranty bit: 1
Writing AT RIL... OK
Initialization AT RIL... OK
Bypass MSL... OK
Checking for compatible phone and cert... OK
Phone KEY ID: 0956
Writing CERT... OK
Checking CERT status... OK
Rebooting phone... OK

Done with Samsung Tool PRO v.33.8


GUIDE TO Write Cert on samsung galaxy A3 SM-A300FU 

1. Download cert HERE
2. Download combination firmware HERE
3.  Flash combination file
4. Open Z3x select model SM-A300FU
5. Open phone dialer *#0808# select Dm+modem+adb
6.  Connect phone then write cert done
7. Flash back phone stuck rom