I have a problem for Unlock sm-G900a

hi to all

i have a problem with a Samsung sm-G900A here is the log :

Code:

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Connecting to server...

Username: Mkamoreno

Authorizing...

Checking balance...

Your balance: 10 credits.

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Connect phone to UART cable, phone must be ON and screen must be

permanently active!

Searching for a phone. Please wait...

Found phone on COM37

Reading info...

Modelo del teléfono: SM-G900A

IMEI del teléfono: 3534110629xxxx

MSL address: R38F40L264

Requesting MSL code...

Connecting to server

Username: Mkamoreno

Connect successfully to server.

Checking smart card...

Smart card successfully checked.

Sending device information...

Checking balance...

Your balance: 10 credits.

Checking request..

Sending request...

Service is currently not available.

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