Samsung A520F unlock error (Reading SN... error)

Warranty void: 0
SIM network PIN blocked. Enter SIM network PUK.

Code:

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Operation: Unlock
Selected model: SM-A520F
Software version: 34.11

Searching Samsung modem... detected COM73
Reading phone info...
Model: SM-A520F
AP version: A520FXXU7CRL8
CSC version: A520FOXX7CRL8
CP version: A520FXXU7CRL8
Product code: ETL
Phone SN: R58K20RW1TJ
IMEI: 3552120991*****
Unique number: CBJ10811CC026C4
Reading IMEI... OK
IMEI: 3552120991*****
Reading SN... error (1)

Done with Samsung Tool PRO v.34.11

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