OBDSTAR X300DP RFid adapter tech support for RFid adapter not working.
The X300 DP displays: Failed to connect RFID
First,
Check if your OBDSTAR X300 DP is authorized or not.
The authorization have to be done by manufacturer
This Rfid will not work until the main unit is authorized by the manufacturer
OBDSTAR X300 DP authorization service (FREE):
http://www.cardiagtool.co.uk/obdstar-x300-dp-full-version-plus-p001-programmer.html
Second,
Reboot tester.. or try different version of software of vehicle you are working on
Third,
You should connect using the USB on the OBD Cable plug
Reference: Rfid adapter helps your OBDSTAR tool to program key with VAG 4th&5th generation immobilization! 