i9505 5.0.1 reset msl

Hi,

I have a problem. Need to repair IMEI, but when I try to repair get message that I need to reset MSL. When I try reset MSL get error:

Code:

Operation: Reset MSL
Selected model: GT-I9505
Selected port: COM496 SAMSUNG Mobile USB Serial Port
Software version: 23.9

Reading phone info...
Reading IMEI... OK
IMEI: xxxxxxxxxx
Reseting MSL security... error

Done with Samsung Tool PRO v.23.9


What I miss and where is a problem?

thx

BR

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