G925T 5.1.1 unlocked

i have important question .. i need to tell the customer.
Does it relock if updated or reflash with original soft again ?
is the unlock permanent ?

Waiting ADB device...
Please, allow USB debugging on phone... OK
Reading phone info...
Model: SM-G925T
Android version: 5.1.1
Product code: SM4G925TZDETMB
Phone version: G925TUVU2COF8
PDA version: G925TUVU2COF8
CSC version: G925TTMB2COF8
CSC country code: USA
CSC sales code: TMB
HW version: REV0.2
Phone S/N: R58G7254N8E
Modem board: SHANNON333
RF cal date: 20150731
IMEI:
Checking Super user right... true
Initializating zTool... OK
Running zTool, please wait... OK
Reading nv data... OK
Checking NV data... OK
Calculating... OK
Writing nv data... OK
Rebooting phone... OK
Unlock done

Done with Samsung Tool PRO v.23.5

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G925T 5.1.1 unlocked