[Rfdump] Communication error with tag

[Denis *]

Hi all,

After I was able to open the COM-port in the VM and RFDump is able the reset the RFID-reader, I want try to readout a tag. RFDump identificated the tag 
(Mifare (ISO 14443 Type A)), but in the window in background I could read

“could not read page 00
could not read all pages”

After starting the function “Crack Key A” or also “Crack Key B” two windows were opened. Once the normal to show the key-search and the second shows a message “Communication error with tag”.
What did I wrong  and how can I make the communication possible?
I hope you can help me.

Cheers Denis 

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