a520w msl unlock error

allways same problem

Checking Login and Password... OK
Ballance: 40 crd.
You have 40 credit(s) left. This operation takes 5 credits.Continue? Yes
Searching Samsung modem... detected COM627
Reading phone info... OK
Model: SM-A520W
AP version: A520WVLS1BQK1
CSC version: A520WOYA1BQK1
CP version: A520WVLS1BQK1
Product code: GLW
Phone SN: R58J30QZRBW
Unique number: CBJ10F14DFC1814
Searching Samsung diag port... detected COM628
Reading phone info... OK
CP version: A520WVLS1BQK1
CP build: Nov 10 2017 19:02:19
Reading data from phone... error (1)
Done with Samsung Tool PRO v.30.8