Help with imei S720T sprint repair

[thewsn]

I have a L720T that I tried to repair imei since the firmware was damaged, after installing the rom 5.0.1 of sprint I was in imei unknown, / 00 I do not have efs or qcn support, in z3x I do the repair and it makes the process successful But the restart is still the same, what can I do?
I have tried lowering the version to 4.4.2 and I can not even repair the imei.
I have also tried several versions of z3x.

I already installed version 4.4.2 I did the repair and it is still the same with unknown imei.

I have also tested with previous versions of z3x and the same thing happens to me, it ends the successful process and continues with unknown imei.

I leave the log of the operation.

Operation: Repair
Selected model: SPH-L720T
Selected port: COM15 SAMSUNG Mobile USB Serial Port
Software version: 27.7

Waiting ADB device ... Ready
Reading Phone Information ...
Model: SPH-L720T
Android version: 5.0.1
Product Code: Not Active
Phone version: L720TVPUAMK5
PDA version: L720TVPUCOK3
CSC version: L720TSPTCOK3
Country code CSC: USA
CSC Sales Order: SPR
HW version:
Phone SN: 00000000000
Modem: MDM9615M
RF cal date: NONE
IMEI:
Initialization AT RIL ... Done
SPC Bypass ... Ready
Restarting phone ... Done
Repair ready
Done with Samsung Tool PRO v.27.7

PD: IS L720T no l720

HEEEEEEEEELLLLLLPPPP!!!: Icq06:: Icq06: