J530F unlock by server

Hello!

I m trying to unlock J530F with credits but it gives me an error.

Checking Login and Password... OK
Ballance: 30 crd.
You have 30 credit(s) left. This operation takes 5 credits.Continue? Yes
Searching Samsung modem... detected COM366
Reading phone info... OK
Model: SM-J530F
AP version: J530FXXU2ARA2
CSC version: J530FVFG2AQL1
CP version: J530FXXU2ARA2
Product code: CNX
Phone SN: RF8K10QACDE
Unique number: CAJ00F49BEE53C4
Searching Samsung diag port... detected COM367
Reading phone info... OK
CP version: J530FXXU2ARA2
CP build: Jan 12 2018 14:09:15
Reading data from phone... error (1)

Done with Samsung Tool PRO v.30.8

Any idea?

Thanks!