samsung s5 g900a msl unlock error..


Using Version…1.0.0.0039
Selected Port VCP0 = COM3
Selected Model GT-I5503
Selected Task SAM MSL UNLOCK
ALL SAMSUNG MSL UNLOCK STARTED..
Searching Phone Please wait…
Phone Found Wait…
TEST MODE OK..
Details. SM-G900A,REV0.4,G900AUCU4DPH2,G900AUCU4DPH2,G900AUCU4 DP
Model := SM-G900A
UNIQID := C1608A69AD2DDB1
Phone IMEI := 35469106399905
Device Knox Warranty is := Not Void
MSL Address:= R38FC0NHLB
RESET EFS FIRST OR USE MSL CODE…
!!! FAIL !!!!
Total Time Take…00:00:33
Log Saved

I believe the bootloaded is closed so I can’t reset efs.. I just need to unlock msl code..
let me know how I can fix this error..
Thanks